2 stroke idles but wont rev

2 stroke idles but wont rev I understand your concern it is freaky when the bike revs up with no load. 1. Had the 5 speed/4. 6-stroke. Using a volt meter, check the TP pot to see if the resistance varies. Now the thing is if i keep pushing the choke it will rev up to about 5000 and seem to run somewhat normally. Reed valve damaged. Carb and filters all seem ok. Never set the idle so the chain runs when the throttle is released. Off idle heavy feel or sputter. Start the engine and let it warm up for 5 minutes. 2 cycle engines are not meant to sit at idle or they will not burn off all the oil. The choke is only for starting and should be turned off as soon as the bike starts on a 2 stroke. • (6) Set the low speed fuel adjustment. Engine will rev with throttle, but is rough at times (because it is choked) 4. I only ran it for 20 minutes or so with 91 then drained it refueling with clean 98 etc. 3L Power Stroke Diesel - Idles but won't rev up, need some help guyz - Problem started 2 days ago, driving around and my truck would stumble and lose power. Ralph01 · Registered. Could definitely be the intake manifold but based on your description, it is most likely the rubber choke plunger pad not sealing. have changed to spark plug a nd made no difference. The CDI's get wet and need to be replaced. Jump to Latest Follow 1 - 5 of 5 Posts. Idles but wont rev up. 2008 Audi A4 Quattro 2. Then slowly turn in the low speed jet, until it starts to die, then back it out another 1/4 to 1/2 turn. The throttle moves through its required range but boggs down right at 2,600-RPM. 3. If it does not you reach inside of the exhaust outlet with needle nose pliers and pull screen out. It is blowing raw fuel out of the intake when it idles. Weird thing keeps happening where the car won't rev past 2. Joined Apr 30, 2015 · 3 Posts . Back to Home Reply Quote. It is imperative that these symtoms are investigated as the result of running an engine lean can be disarstrous. If you don't have a tachometer, try to set the speed so the saw will idle with the chain stopped. General Scooter Chat. the engine starts up perfect, but when reving … 225 horsepower Yamaha ox66 My 225 horsepower Yamaha ox66 starts up just fine but smokes more than usual at startup and at low speed idle. I checked the battery and it is good. Pulled the plug, and it looks ok but is coated with oil. In larger engines, the fuel is injected into the engine. 4-stroke. 0-litre V8 engines that rev to 6000rpm. Most 2-strokes are not very efficient and will burn part of the air/fuel mixture as it's leaving the exhaust port. Carbon is built up because the saw is idled for more then a few seconds at a time. so today we did a lot of high speed A little RCSB 2002 silverado. 2005 Johnson 90HP 2 Stroke Idle OK guys I can always count on this site for help when having fishing questions so now I need some help with a motor question. I think you're flooding out when you apply the throttle and that's why it won't rev up. Set the low speed fuel adjustment. 1984-1994 Yamaha Outboard Service Manual/WorkShop Manual Application: 2 hp 1 cyl. If the air filter is high up on the handle bar it tends to last longer from dust build u p or if it's low, close to the engine, being closer to the ground, then you can quickly build up dust blocking quicker. Cylinder nuts not torqued properly. check the idle screw again, carb off and looking down the bore to make sure it is closing all the way may end up being necessary. 5 l engine. It will idle but once you start to hit the gas it just boggs down the further you pull throttle. It's been about 2 weeks since I last rode my bike and it ran decent back then. Jump to Latest Follow 1 - 9 of 9 Posts. After the engine warms up, it seems to work pretty good and I can ride it without issue. The IDLE MIXTURE SCREW (FCR) controls fuel delivery to the idle port and the SCREW is located on the engine side of the carburettor slide. Disconnect TP sensor connector. Its not the seal by the mag, and its not the intake gasket. It needs a valve cover gasket and serpentine belt as well. If it was so low that the engine was lean at idle, it wouldn't run at all from mid-top. I have a 2 cycle Craftsman leaf blower that won't rev up. Any tips would be welcome. Joined Feb 12, 2005 · 16 Posts . 4000x2 LED lights up front for dark country my motor cuts off right after I put it in gear. Extended time properly fed @WOT under load will clean them out, and not leave them awash in oil like your Efco in the pix. I inspected air filter and even took it out and ran it that way and The idle is strong, but not consistent. Just thought I would share this for other people's benefit. i have little 850w 2 stroke genny, trouble is it won't rev above idle. 2. I've been lucky enough to not even have to take a carb apart. 5 (68. Prev. It will rev in Park or Neutral, but put it in gear and push down on the gas pedal and it will stutter and stall and will not move. I cant get into the power band at all. Depending on your particular 2 stroke, the air filter can be in 1 of 2 different common locations. I could hold the sparkplug in my hand and crank the atv and hardly feel a The rpms would be so high you could not shift the motor into neutral. This topic has 23 replies, 5 voices, and was last updated 1 year, 4 months ago by fleetwin . This oil is required to lubricate the engine. Stonecold754 · Registered. make sure the air filter isn't overoiled too, and there's nothing blocking the intake. With the high idle on I can slam the throttle around like a fool and it wont quit. It is unrideable unless I just want to roll around the block at idle. Turn ignition on. Although, it’s still NOT time to go WOT (wide-open-throttle). In most small 2-stroke engines, there is no crankcase oil. It will fast idle a little faster than idle, but not much more and it sounds rich when fast idling. Sometimes it would idle so high in neutral it would hit the rev limiter. I have a manual transmission, can get the car started and revved up to 3500rpm then it idles down to 1000rpms and dies. A vacuum leak on a carbed vehicle causes high idle conditions, which is where the confusion comes in. R. Techs are stumped. If the saw will not idle, go to the next step. Engine Will Not Rev Up. 1994-1997 Power Stroke Technical Info. Today i tried changing spark plug(yes i have the right one)Now it wont fire up on one cylinder,could it be caused by a weak coil? 7. Home › Forum › Ask A Member › 2000 Johnson 50hp 2 stroke questions. cleaned spark plug, cleaned exaust pipe and silencer, checked reeds a couple of times cleaned stator and So the issue at the moment is that it won't rev up over 2000 rpm while under load. Prior to my purchase the previous owner, a friend, said he cleaned the carbs. I was able to tune it to run on full throttle (I turned it . Electrics still need work. Read about the park brake ,should have 2 wire on off eletrical switch. 5k, idles above 1k. 2 is the fact that they have fewer moving parts, which decreases the constant load on the engine, allowing it to burn the air-fuel mixture more efficiently, and reach Car won't rev past 2. Step 2 - The idle air control motor (valve) is responsible for controlling the engine idle speed, if this part fails or becomes weak the engine idle speed could become erratic, additionally, this condition may or may not trigger the MIL (check engine, service engine soon light. comhttps://www. If you leave the motor out and these suckers get damp they short and then are shot. I have taken it out about 4 times now and runs beautifully. 6. Has gas ever ran out the over flow tubes ??, if it has, thats a sign the float & needle not working right not shutting the fuel off when the bowl is full or trash in the fuel system keeping the needle from seating & over flowing. The needle jet is a push fit into the body and is sealed in with an o-ring. Adjust the Low (L) jet for HIGHEST idle RPM. The same thing is happening. Try flushing your carb through with pure petrol. Joined Nov 13, 2011 · 237 Posts hi can anyone help my polo1. Prev. 04 6. Disco 1 300TDi Idles but won't rev! Discussion in 'Land Rover Discovery' started by Mark C, Jul 19, 2020. 0L behind it. 3 but I threw the 6. General Scooter Section. 5k, idles above 1k. . Problem may be intermittent. Also, exercised properly, a chainsaw with a spark-arresting screen at the muffler discharge will stay clear and allow exhaust flow. I think that's the name for them, something like capacitive discharge ignition, not sure. Screw in the idle-speed screw (4) to obtain a slightly-higher idling speed than normal (about 1200 rpm for a four-stroke engine or about 1400 rpm for a two-stroke); Then adjust the air- adjusting screw (1) to obtain the most even running. I tried unhooking a plug at a time and seemed to make no change to the idle. 1; 2; First 2 of 2 Go to page. 250 starts and idles, won't rev up by NevadaBuggy » Sat Mar 29, 2014 7:27 pm My 250cc buggy will start right up and idle great, but when I push on the gas, it bogs down and sort of misses. Discussion Starter • #1 Hi was using chainsaw fine 15 20 mins and it then would not rev. Setting the timing advance at full throttle, 1985 25HP In most small 2-stroke engines (like those for string-trimmers and chainsaws) the oil is mixed with the gasoline. Car has done 109,000kms (65,000miles or so). but stumped Truck Starts and idles, But very low like 500 rpm. Thought it had run out of fuel. Select Post; Deselect Post; Link to Post; Member Worth screwing the mixture screw in all the way (gently) and unscrewing it two turns as a base setting. youtube. Try to set the speed at about 2700 RPM. Off-Topic Chat. Advancing the ignition timing TOO MUCH at any speed will result in less power, and may result in damage to the engine. Most likely the idle validation switch is shot. Inspect the needle jet and the hole it mounts in. After letting it idle for a few minutes to burn out all the old crap in the motor, I tried to rev it up & it is not peaking RPM's!!!!! It idles perfectly, but once you get on the gas, at about 1/2 throtle, it seems to bogg. The Lobby. 6. I The idle timing is set with the separate idle timing screw at 8 degrees with the motor at 725 rpm. throttle and or choke until its warmed up. Cylinder head warped. Then unscrew the idle-speed screw again until you obtain the normal idling speed. Joined: Dec 2010. Jump to Latest Follow 1 - 5 of 5 Posts. I have replaced the carb ( tried that after I cleaned original) New plug. 0 idles but won't rev past 1000 rpm. 3. It runs OK at a fast idle, and accelerates fine, let it slow down to idle and it will get rough and eventually stall. Starts and idles fine, but no power, won't rev past 2K. Inside the outlet is a fine mesh screen. 05-06-2008, 10:38 AM #3 If your 2 stroke engine has a very fast idle or erratic idle it could be due to an air leak. Re: Mercury 2. (43cc) 2-stroke 1984 1994, 3 hp 1 cyl. When I start the engine, it idles at 1400-1500 RPMs. Car won't rev past 2. Wondering if anybody knows what this could be? Thanks. Fuel mist should come up but not large droplets like that. Start the engine with or without the choke so it will idle, then spray wd40 around the carb area and air filter rubber joints, if the revs change you have an air leak. Check the carburetor to make sure it is clean and free of impurities. 2-stroke. If it still will not start, it means something else is (mechanical or electrical) wrong too. Still does not idle smooth. 2. The old owner says there is an intake gasket leak as well. I'm going crazy Here!! So these are the things I checked Please help me add to it 1. I've seen it before. fixed!! why a 2 cycle engine idles, but wont rev up? has no power ? dies? then you must watch this! Since I am holding the throttle open trying to get it to go faster and the rpms won't go up, it does start to smoke a little from being too rich or kinda flooding. The Dawg Pound. So the tech just drove the car again. Wrapped once around both spark plug wires, per the technicians reccomendation at tiny tach. (5) Begin by setting the idle speed. If it's a fuel filter use a piece of wire with a "U" bent on the end and fish around in the fuel tank for the filter on the end of the suction tube. Plug gap OK. This is done with the fast idle knob turned counterclockwise all the way. 2. 9HP (9. Cylinder head gasket not sealing. One day my Stihl 017 refused to rev up past 3/4 throttle. The engine will start, but not easily and may have one or more of the following problems: Maintenance · Dirty air filter · Dirty fuel filter. Go. I have checked and changed everything I can think of. 5mm/65. Will start and idle, but won't rev. It's got an air leak. Also cant figure out where batt charging voltage comes from. Mercury 2-Stroke Outboard Boat Motor Service Manuals. #2 is on the drivers side. Give it gas, won't rev up but it cleared and ran fine for a mile or so then it comes back (off and on all the way home). So far so good. When the machines are here is an overview of how two stroke motors work. mike8cyl · Registered. Changed battery & Spark plugs . R. New as well here , not new to service work . 98 wolverine 350 , backfires above idle , will not rev . Your 50-55 would be too low according to what I have been able to research. M. Otto engines can be 2 or 4 stroke, so can diesels. Bike idles fine, gears sound good. Never set the idle so the chain runs when the throttle is released. I can make a 20 minute run from one spot to another, shut the engine off and and start it up. That Larry. Steam/smoke out of telltale until in gear and hitting about ~1200 rpm No big surprise - overheats while idling/moving slow. Recently, I have developed a problem where it will hardly ever stay running at idle. Last edited by RonnieRev; 05-06-2008 at 10:43 AM . . At low RPM, the crankcase vacuum with the. 3000 rpm may sound like its high for in flight idle, but it also revs to 8500 rpm as well. Reset tiny tach to 180 degrees which = 2 sparks per revolution. Hey guys. Idle rpm read 4000 - 4100rpms with the ear muffs hooked up on the hose. One should be idle mix and the other should be high Crank the motor, get it warmed up. If it still does it, and you're positive it's not a fuel issue, bypass the switch and see what happens then. Slowly turn in the screw until the engine surges or starves for fuel. This adjusts the mixture at idle and low speeds just above idle. From experience (little) I've discovered that 2-strokes will accept a brief burst of pure petrol without causing harm. As for your idle, that motor should be adjusted in the water and under load to get the correct back pressure. [citation needed] It is not advisable. Other Projects. To check for an air leak, you have to perform a pressure test. 11/17/02 7:34 PM. 9-HP) 2-Stroke & 4-Stroke 1990-1998 - 10HP (10-HP) 2-Stroke 1990-1991 - 10HP (10-HP) Comm 2-Stroke 1990-1991 - 14HP (14-HP) 2-Stroke 15HP (15-HP) 2-Stroke & 4 Stroke 1995-1997 - 18HP JET (18-HP JET) 2-Stroke 1990-2001 - 20HP (20-HP) 2-Stroke 1990-2001 - 25HP (25-HP) 2-Stroke the bike is difficult to start and when idling will eventually stall and when you accelerate it stalls, i had to wind in the idle screw to get it to idle. F. . Rules, New Member Introductions, and Forum Information 2 Stroke 50cc 1st. Begin by setting the idle speed. I am now looking at the fuel pump . Pull the plug wire and try to adjust it so there is about a 1/4" to 3/8" gap between the cap conductor and sparkplug. Adjusting the idle screw has no effect Well I reset the low/high jet screws to factory specs, high jet wasn't out as bad as i thought, but then the nightmare began as i exposed the rotary valve to check the timing again . Anyways, the bike runs great. 600 sdi wont idle - posted in REV Chassis - Performance and Trail Models: Been struggling with this problem for a couple of weeks. e. 0L Power Stroke Technical Info. Has been acting up since hard landing at 1990 Johnson 130: Will not idle in gear with constantly using key primer. The oxygen sensor will detect the extra oxygen that is entering the engine through the vacuum leak and will signal the computer the exhaust is lean. then as it gets hotter i have to turn the airscrew in till its nearly closed then it will idle ok,if i open the airscrew 1. On your muffler you have an outlet either screwed on with two or three screws or it is fixed. My engine would rev between 1000 and 2000 (start at 2000, drop down to 1000, and rev up again, repeat) if in park or neutral. The bike is very mechanically souund. Go. Check the air filter. In gear it will run at around 2000 rpm, and occasionally rev up to 3-4000 rpm for a sec, and die back down to 2k. Wont idle down and surges under 1800 rpm no load. I put new gas, a new plug and put a new carb kit in it but it still won't get above about 1/3 Hi I have an LT50 that has been in the family for a few years. Engine does not rev up properly: Starter plunger stuck open. I used it in the summer and it ran fine but I tried to use it last week and it starts but won't rev up. , n Physically blow back thru the tube. I checked the fuses and all good. The reason for this is it being a 2-stroke engine. k. At Idle cold it runs SMOOTHLY, and warm it runs smooth with no missing or hesitation right up to that brick wall of 2,600-RPM. if it's rich enough to not rev high it might need a couple sizes smaller, if that's the problem. Re: Stihl 031AV will not rev up, idle is fine There is something simple you could try but if the results don't improve I still wouldn't rule out a faulty ignition, electronic or not. But try to go over 10mph and it seems like a rev limiter is keeping it from going. The reason I say theoretically, is because the internal combustion engine operates in the real world, not a scientifically perfect world, and the I have not attempted to purchase it through the Dealers, but did find some locally at an independent oil distributor. Initially, the engine would start, but die immediately (2 seconds or so) -- we replaced the IAC with one off of the old engine, and it now idles fine. The carburetor is usually the culprit when a motor will not hold the speed or idle to which it is set. Remember that a Dmax is numbered opposite of a gas engine. no flooding or smoking at lower rpms or idle. Tried loading with heaters and didnt help though I only had two 1500 watt to plug in. If you have a manual transmission and you are shifting into neutral to coast to a stopping point, then hanging idle is not uncommon. This is caused by the throttle sensors not reading zero. After the motor would sit it would idle fine until it ran for a while. Husqvarna trimmer won't rev up? I have a Husqvarna 325R two-stroke grass trimmer that is about 5 years old. Sometimes it will snap out of it but usually I have to shut it off and restart it. remove it and try again small short trips wont matter with no air filter. W. If that hub gets damaged, the engine will rev up when you put it in gear but the boat won't go -- kinda like a slipping clutch in a manual shift car. ScootDawg's Scooter Forum a. He confirmed that the electrics were very different than an original harness. It will generally idle fine but will not rev up past about 1750/2000 rpm without cutting out. Then it takes at least 45 seconds(I timed it a few times) it drops down to 800-900 RPM's. Its not the carb I tried 2 different ones. Anything holding the throttle from returning to zero will cause this. starts and idles (low) but NO rev above - Ford Ranger Forum Posted: 19:44 - 30 Nov 2009 Post subject: Will idle, but will not rev up Hi all, ive just put a new engine in my Triumph Trident, however, now that its up and running it refuses to rev. This will get you in the ball park. Usually I can start it again after two or three kicks. What happens when it goes bad and how do you check it ? An you just plug it into itself ? Do not keep adjusting the air screw out past the point where the engine idles the fastest. Jump to Latest Follow 1 - 20 of 29 Posts. It even pulled my 245 lbs pretty well across my back property. Discussion Starter Ultimately, if there's a low or disproportionate air and fuel supply, the engine won't rev beyond 4,000 RPM. Its got a problem though in that it starts and idles but will not rev at all - its just stalls. I recently assembled an 01 suzuki jr 80 that i got in a wet carbaord box completely dissasembled. It controls everything on your ATV and is located down by the radiator (at least on mine it is). try going 1 size smaller on the main jet and see if that helps. 95 xplorer 400 idles rough & wont rev up. When I went to use the strimmer after the winter it would start and tick over but not rev up. To adjust the carburetor, start with both screws backed out 2 turns from the closed position. 50cc idles but won't Rev by: Alleyoop - Jul 14, 2014 12:36:07 GMT -6 hitshane likes this. – Pᴀᴜʟsᴛᴇʀ2 ♦ Aug 16 '18 open, for starters. Jump to Latest Follow 21 - 25 of 25 Posts. 5 HP 4 Stroke idles but won't accelerate Having same problem with my 25hp. Slowly turn in the low speed jet, until it starts to die, then back it out another 1/4 to 1/2 turn. While idling like this, if I gave it more choke, the revs I have a 1997 c40tlrv 40 hp 2-stroke, 3-cylinder motor. With plug removed the jet seems to levitate in the Help: 07/08 Camry Starts And Idles But Won't Rev by Nobody: 9:14pm On Jun 18, 2012 Hi all, I just got back from a Trip and left my car parked for a couple of weeks. if all else fails it could be a sticky valve and or a bent valve (I ran a bike on a bent valve for 2 months before it blew) I have a 2000 70hp 2 Stroke Yamaha motor on the back of my boat and after launching the boat on Saturday, I noticed that by moving the throttle, it wouldn't rev the motor up. Now it will idle fine and starts right up just like it should but when I go to ride away, as I give the throttle a twist it first starts to idle up a bit and then the revs drop to about 2000 rpm. Idles fine in park but won't go over 2k rpms. If the saw will not idle, go to the next step. Posts: 2. Crank the saw and set it down for 5 to 10 minutes. Onan b48m engine. Go. The bike is standard apart from the toomey pipes, as mentioned in the other thread it does the same with allspeeds when i swapped to rule out the pipes. If you do your engine will probably run with a lag or be very mushy. Nitro fuel will cause a fireball from hell on a 4000 hp dragster but no nitro is used on a 2 stroke with 10 hamster 2) Idle Set idle speed to proper rpm, by adjusting the IDLE SPEED SCREW. A vacuum leak on a fuel injected engine will cause high idle. I lashed the valves that were out of adjustment to 0. After repeated attempts, I finally got it to idle with just a small amount of choke. Never set the idle so the chain runs when the throttle is released. The jets may have a build-up of oil - or sediment. Try turning the choke off right away and see if it keeps running. Will eventually start on Choke with throttle in start position but will not run. a. spraying solvent on the engine won't cut it. blue83ranger · Registered. Replace the filter if you haven't already done so. Main jet clogged, restricted or wring size. richardsoucie · Registered 2006 Nissan Altima 2. Last A smaller jet will give exactly the same mixture strength but won't require the screw to be backed out so far. It won't start again now I can get it to start (after about 20 attempts) then it dies when I try to rev it up,then you have to try the choke and pull for ages to get the same,thought it might be a filter issue but plug is wet when I remove it. 0 won't rev past 4k idles fine. Jump to Latest Follow 21 - 31 of 31 Posts On my bike, if I block the fly-weights so that the ignition is fixed at fully retarded, I can still rev the engine to as high as 2500 rpm. serial jg021098. We where told the motor ran fine, but obviously it does not and im not sure the owner ever had it running. When you press the throttle the revs won't increase you will get the sound of more than enough air but not any fuel. as soon as Throttle is given, it shudders and shakes and wont rev any higher than idle. Revving the engine in neutral will result in RPM dip below idle RPM, RPM’s will drop quickly. If the saw will not idle, go to the next step. At 2k sputters bad. Idle reads 1860 -1900 rpms. Mix a fresh batch of blower fuel. I cleaned out the carb and installed new jets but that make sure your cable isn't doing something to hold the throttle open either. I can close the needles, and open them too much. I get it and put 93+stihl oil mixed in it and it doesn't run good at all. I have replaced the spark plugs which were due and replaced the idle air control valve also. The dealer said he couldn't find anything wrong so I took a video. They say it must be 70 psi. 1. It's like it's in limp mode. If you have the screws pull them out remove screen and put back cap and screws. For example, let’s say you have two 4. It engages the lower unit fine and makes the boat get in gear but will not take any rpm's. I installed a new carburetor, fuel line and filter - no difference. You can either clean it or just leave it out. Replaced, IAC,tps, plugs, wires, throttle body, catalytic converter, ignition module, coil packs, fuel pump,filter. The water is pretty hot coming out of the telltale, but it has a good flow. Things Ive tried: New gas. If you are in a forest area you are supposed to put it back it is classified as a spark Low float height won't cause a hanging idle. jeremy fountainthemowermedic1mail and business inquires themowermedic1@gmail. Give me a four stroke & I could tell you the problem, but a 2 stroke? New to me!!! Yamaha 40hp 2 stroke I have a manual tiller 40hp (EX40) 2 stroke outboard motor engine having issue with engine cannot rev up. I removed the exhaust deflector to check the spark arrester but it was gone. When I put the throttle on high it seems just about 1/2 speed, and as I decrease the speed on the throttle the motor revs stays the same until I get to about 1/2 speed, then it decreases and The truck starts and idles but will not rev much at all. It will idle but when you increase throttle, it sputters and dies. 2-stroke jetting for dummies . You "NEVER" ever run your engine over 2000 rpms, while in neutral; on a 2 stroke engine, no matter what the reason or who told you so. 5 (98. Fast foreward and its assembled but will not run correctly. The engine responds to tuning, but not by much. Check the fuel filter and clean or replace it if it is dirty or clogged. I have to rev up the motor in neutral and then almost slam the motor in gear to get moving. Warm up the bike and see how it idles,how it runs at mid throttle,and Hi guys I know that with 2 stroke bike engines you are supposed to let them warm up before you use them. 0T - Starts then dies. In 4-stroke engines, the lubricating oil is in the crankcase. Check engine light didn't 1990 ford ranger 2. You're most likely just seeing the burn. Re: 850 etec won't idle popping and backfiring at low rpm It has 1100 kms ran fine til today seems like it idles on one cylinder but when he pins it the sled will clean up and run fine hard to start idles crappy and often stalls smokes and pops and backfires if you blip throttle but cleans up at wot . Off the Idle board? Hey guys- I was at my girlfirend's parent's farm this weekend trying to get their Bruin 250 ATV running. It is recommended to clean out or replace the air filter in your Accord. but with it off it will go all the way. It is throwing a few codes regarding TPS high voltage MAP high voltage. The top end of a two-stroke engine might need to be rebuilt if there’s been a reduction in compression that can cause hard starting when the engine is warm, inability to idle or a loss in power. 2008 Audi A4 Quattro 2. Hey guys first post here I have a 2011 teryx completely stock anyways I got it hot so I rebuilt it new gaskets piston rings now that it's all back together if I plug my air pressure sensor in it won't idle or hit rev limiter and is very hard to start. Beverly A. You've got a partially plugged jet on the idle circuit, which leans the motor out and causes it to rev uncontrollably. he got it for xmas and the and the dealer is closed for 2 weeks, my son is not happy as he cant ride his new bike. Then Idle is erratic, and gauge synch shows #1 and #4 pulling 14-16 Hg (close to factory setting) but #2 and #3 fluctuating between 0-10 Hg clearly indicating a problem. The battery got drained and I was able to jump start with another battery. In drive won't go over 30mph & if rpms get to 2k sputters loses power badly. bike idles but wont rev just stalls. Intake Gasket 2. These assumptions are based on the fact that the speed screw setting is not opened more than 11/2 turns. Sometimes, your chainsaw will only idle for about 5 to 10 seconds after you let off the throttle and then it will shut down. Idles perfectly. Nothing. Chainsaw Won’t Idle. Try holding the yellow reverse override button down. any ideas? Thanks in advanced That doesn't sound right. Now that the air screw is adjusted so that the engine is running it's fastest, shut the engine off and turn the air screw clockwise, counting the turns until the air screw bottoms out again. In neutral, it will spool up no problem. Check the in-tank filter as well (located in the tank attached to a freely moving fuel line) Also, the Stihl 2-stroke machines have a spark arrestor screen located at the outflow port of the muffler, either in the form of a bolt nozzle, or screen plate. If it won't stay running at idle, you'll need to give it a little throttle to keep the RPMs up just enough to keep it running while you play with the adjustment. (iii) Turn the idle mixture screw in till it lightly seats counting the turns (probably about 1 1/2) so when you put it back in you have a known starting point to tune from. Look out for my video on YouTube where I smash it up with a 22t digger. 1999 - 2003 7. Re: 2 Cycle Will Not Rev Up So far, every time I've had that kind of problem with a 2 cycle engine, it's either been the exhaust plugged up, as already mentioned, or a simple carb adjustment. I suggest cleaning the IAC with carb cleaner and then re-installing it. With a carbureted 2 stroke ported for mid to high torque at mid to high rpm, vs ported for torque rise off peak and peak@high rpm as in a chain saw, if you set idle speed at an rpm where the engine operates just below the rpm of a resonant "band" where gas exchange and ve are poor rendering incoming charges highly diluted with the previous cycles exhaust, random hit-n-missfire occurs. 250 HP Models 3. If that is the case, that hose is going to the wrong Looking for some tech help. we know that it's either ( ( ( lack of spark or fuel ))) a coil or condensor may cause this at times. 2-Stroke Carburetor Main Jet Why Proper Carb Tuning Is Critical For 2-Stroke Engines. After this time, give the throttle a little flick, and it if still bogs or hick-ups then it’s not warm yet. I there, i have an old 91 petrol ford courier ute that has developed what i think is a fuel fault in the carb. Jump to Latest Follow 21 - 24 of 24 Posts. It acts like the kill switch or teather switch is off. 9 hp four stroke; 1992 40hp yamaha lifting ring '74-'79 Mariner55 fuel problem; Looking for more agressive prop; 1992 yamaha 60hp 2 stroke no 2 piston destroyed; 150 two stroke wont idle; fuel issue; 2001 Yamaha 115 HP Acceleration Problem. Hi there. A prop with thru-hub exhaust won't have a shear pin -- it'll have a rubber inner hub pressed in, designed to protect the drive train from the shock of shifting into gear, and impact with the lake bed. If it will not idle, but seems to rev up, down, and then dies when you try to adjust the idle. My main issues are that i cant get it to idle even when hot no matter how much i F@$# with it and that with the choke on when it starts it revs about as hard as it will go. Then check to see if the idle validation switch is working. The motor starts right up either with the choke or at a fast idle (if warm). 3. Sal: Riptide23WA: posted 06-28-2007 08:58 PM ET (US) There is fuel running May 02, 2012 · 96 Cr250 wont idle at all: 1stcr250: 2-Stroke Dirt Bikes - Honda: 1: 06-10-2010 11:26 PM '97 CR250 won't idle: whitey nocar: 2-Stroke Dirt Bikes - Honda: 5: 08-19 This will work for both two and four stroke engines. 6 v reg gl estate a couple of weeks ago suddenly cut out and would not pick up,took it to garage they put a new distributor in and coil and after a couple of weeks its done the same idles perfect but cant rev it dies right away ,any ideas please . Engines do not explode unless they are drag racing engines bored out and using high octane fuel with a bearing out of specs or failing. 95% of starting problems are caused by the same group of things and don’t require a mechanic. This lack of seal causes erratic idle as it leaks air into the pilot circuit. I have a 2014 600 MXZ Rev-XP Carb. Drove and parked perfectly fine right before this happened. One should be idle mix and the other should be high speed. Then 2 days later it refused to start and resulted in the afore mentioned new parts before I could get a decent spark. Up against the rev limiter while in neutral, . Joined Dec 14, 2019 · 2 Posts . Got it started again, tried messing with the air screws but that didn't seem to help (started at the factory 1. put code reader on Car starts, idles, but will not rev under any load. Combine them using the mix ratio provided with your model's fuel specifications. (6) Set the low speed fuel adjustment. The sled has new gas in it. Joined Apr 23, 2012 · 2 Posts . Jump to Latest Follow 1 - 3 of 3 Posts. This will make is rev up and sputter and then rev again and sputter. Starts very quickly but will not stay running. I have had the ecm tuned to what I need and the guy that tuned it has been troubleshooting with me but we just seem to be baffled! The truck:-Starts great-Idles great. Perhaps the terms are in reality not well defined, since Otto basically patented a 4-stroke spark ignition engine, based on inspiration 2-stroke spark ignition engine and Rough idle, 1988 Mercury 90hp 3 cyl 2 stroke 1998 Mariner 40HP 2Cyl - Changed Stator,but got a explosion when cranking. If you don't have a tachometer, try to set the speed so the saw will idle with the chain stopped. Will cause a rough idle/clatter, and no throttle response, because the engine is in limp mode and running on four cylinders. Mixed up some fresh new fuel - same. 1; 2; First 2 of 2 Go to page. Must hold slight throttle and feather choke to keep engine running 3. Mind you it revs freely out of gear right up there to 5,000-RPM . Fuel pressure is good (65 psi at all rpm), exhaust is clear (i. Because the machine runs better after you choke it that is telling me that you have a fuel restriction somewhere. When i hit the gas it w 2. Has about 1037 hours. The usual cause of abnormally high idle speeds are vacuum leaks or an inoperative idle speed control motor. B. I’m suspecting the coil might be causing this, as the bike runs when #1 and #4 wires are pulled, but not #2 or #3 even individually. 1 is the displacement, they generally have smaller combustion chambers, which means less fuel burned. If it revs like normal, then it’s time to put it in gear. Used Clamp Bracket Needed for 89 6hp 2-Stroke; 88 Yamaha 150ETH Outboard; 50hp need help; 9. He's gonna drive it a few more times after he cleans the MAFs and TBs. It starts and idles, stalls occasionally. I have a Honda strimmer fitted with the GX25 engine which is basically a tiny version of the GX140 familiar to a lot of towable digger owners. Fuel System · Improper idle screw adjustment · Improper carburetor adjustment (high side, if adjustable) The next time i went out it started up fine, idles, and revs to about 1/2 throttle the bogs and sputters HARD. hope this helps May 10, 2009 | 2003 Yamaha YZ 125 So what happens is I'll start it up and if it idles to long (usually while waiting on the wife) the idle will drop to just above 500 (just below 750 normal) and no matter how long I floor it for it will not rev up. Now, on low idle, there is a chance it will still quit when slamming the stick back to idle from full throttle. If it starts with the choke, but will not idle with the choke off, check to see if the idle jet is plugged. If Have been having a minor fluctuating idle issue. This equates to 20 ml per liter (litre) or 2. 1 of 2 Go to page. Turn the IDLE MIXTURE SCREW or the AIR SCREW to for correct procedure, achieve highest speed and best response. This problem has plagued me again and again. One has a bore/stroke ratio of 0. I've owned many 2-stroke machines - chainsaws, weed whackers, portable water pumps, etc. Running a motorcycle engine backward is relatively easy to initiate, and in rare cases, can be triggered by a back-fire. Warm, but not overheated, engine dies easily during idle. Joined Oct 3, 2011 · 3 Posts . Thing idles great and will idle for hours. 500-700 rpms. Cylinder base gasket not sealing. If I start it and put it in gear as soon as the advanced idle period ends, I can run through the midrange and at WOT no problem. Generally, if it starts with no throttle and dies when you rev it, then blame the main jet or fuel path. I tried doing this in neutral and while in gear and nothing worked. A rich mixture will cause poor performance, but a lean mixture can destroy your engine (over Sorry to burst your bubble noseall & I’m not sure if that’s what the earlier contributors meant but many performance 2 stroke engines do indeed have valves as wotan states; but I thought they were on the exhaust to scavenge wasted fuel rather than on the intake I very much doubt you will find one on a garden strimmer though check your air filter, it could be blocked. 0 Litre HP Models 225 HP Models 200 HP Models 175 HP Models 150 HP Models 135 HP Models Yes, mine actually serial numbers to 1985 but all of the above is correct. If have a 1971 Suzuki TS90 2-stroke. Thats the best setting for many two strokes. com/themowermed 2007 genuine buddy 50cc 2T. My CEL comes on while the car is running and idle, but as soon as I shut the car off and turn the key Since you say it is viewable, I'd suggest it's not uncommon to see it glow orange at high throttle. have also seen plugs that had almost unseen cracks -- cause problems. Idles but wont rev? Jump to Latest Follow 21 - 29 of 29 Posts. It cycles on about a 20% pattern (where the power drops 20% for a second, then returns to normal) every 7 seconds or so. Discussion Starter • #1 • Dec 14 The poor WOT performance may just be a clogged fuel filter and the high idle may have been a cheap fix for an engine that would not idle at the right speed due to poor fuel pressure. Still seems like a high reading for idle. 9 Just bought as a fixer, now i have to fix. 70 hp Yamaha Very simple Mariner5 air-cooled 2-stroke runs fine on half-choke , dies on anything less. I've had the carb off and cleaned it (though, oddly, I couldn't remove the main jet which is held up in place by a plug in the top of the float chamber . This will work for both two and four stroke engines. it won't rev up. 5 turn rich). Air filter dirty Ok richard what you have is a clogged exhaust. 2. If the mixture screw is more than 2 1/2 turns out turns then the Idle jet is too lean (too Small). I have a 2 stroke Tohatsu was running fine on 98 high octane then I made the mistake of using 91. Should a 2 stroke tick over? you just need to adjust your carb mixture screws located on the side of the carb this will adjust your tickover revs. I have a new diaphram for the fuel pump but it does not seem like a fuel delivery issue. This it what I do and the high reving goes away. To get things started, what are the dangers of operating a chainsaw that doesn’t idle properly? Well, it depends on what type of idling issue we are talking about. Fuel level incorrect. Also, the problem with the old engine was cam being broken in three places. 0T - Starts then dies 1 Answer. Try to set the speed at about 2700 RPM. No snow to ride it. BUT - no more than a few seconds (15-20) of running. . Sorry to burst your bubble noseall & I’m not sure if that’s what the earlier contributors meant but many performance 2 stroke engines do indeed have valves as wotan states; but I thought they were on the exhaust to scavenge wasted fuel rather than on the intake I very much doubt you will find one on a garden strimmer though The scooter runs awesome when its cold but once it gets warmed up for maybe 5min of driving 45 50 when I come to a stop it wont rev past 2k now the one thing I did notice when I have the scooter on the main stand with the airbox on it wont got past 4500rpm. A 2-stroke will not be happy being puttered-about with. Two stroke motors are more efficient that four strokes for a few reasons. Lower rpms are smooth and perfect. i was on my 450 and my friend on the kx and we were having a blast and all of the sudden the kx lost all power while riding, cleaned the carb and check float thousands of times since it happened. com/themowermedic1https://www. After about 2-3 seconds it drops to 1200-1300 RPM's. so if you have a 15 hp 2 stroke you should look at a 20 to 25 hp 4 stroke to get comparable power. 6 fluid ounces (US) per gallon (US). It always ran perfect until recently. It is very hard to start but when it does it runs fine, it will idle for a while you can rev it and all seems fine then it will stop and not want to start again. Once i restarted it had a very rough idle and would die at times and would not rev at all. Pour the two-stroke engine oil and regular unleaded gasoline into the approved fuel container. Throttle valve does not fully open. When I quizzed the Brother In-Law about it he just said oh yeah it started doing that! Not sure if yours is a 2-stroke or a 4-stroke, but a bike mechanic at the garage I use for my MOTs told me that a lot of these small Chinese 4-stroke bikes are shipped with no exhaust valve clearance, which causes issues with running. Depending what the air temperature is, you should let your dirt bike idle for 1-3 minutes. You may have to keep the throttle open a bit. Additionally, a couple time each minute, it will surge, and the rear wheel will actually move a revolution or two, then it returns to idle. Opening percentage should be approximately 70 percent. Most air leaks occur at the base gasket or reed block gasket. It has always been reliable and performed well. A couple of things to keep in mind - one is that a two-stroke will like a richer idle mixture than "stoich", and richer than the setting that gives the highest idle speed. Hi guys, been on before with same problem, bike starts fine but seems to get choked when I pull the throttle causing the bike to die, following advice I have had the carb off and given it a good clean, everything is moving as it should and jets and such look clear, wondering if this could be caused by anything other Update Ok today I purchased new spark plugs, removed the pop off springs that came with the carb kits and reinstalled the old oem springs, and reset the low jet fuel/air mixture screws clockwise until resistance was met the backed them off 1 1/2 turns started it up after priming the fuel system (Hard Start btw) and got her to fire up, adjusted the idle screw until i got the best idle out of Clean the carb,run some sea foam through it,if that doesn't work,try your timing. 9 HP two stroke stalling at low idle. NOTE 1: If your engine is maintaining 60 psi at 70 mph and 15 to 20 psi at idle with a warmed up engine, you do not need this weight oil! NOTE 2: If you have a non turbo engine that has low oil pressure this will also work in it. Adjust both the Low and High jets until just seated, open to 1 to 1 and 1/2 turns open. Guys I am back to square one. And If you don’t have a tachometer, try to set the speed so the saw idles as high as possible without engaging the clutch. my kx 125 just bogs and throttle position above idle wont die just wont rev higher than idle. By carefully playing choke vs throttle you can get it slow enough to put in gear and it seems to develop decent power at higher revs without any choke. Its not the slide because I thoroughly check its multiply times today. After setting the high speed adjustment, run the engine at idle and play with the low speed adjustment. The wire was hooked up to the bottom spark plug wire. Warm engine up and set idle, then turn mixture screw until engine runs fastest. Lights start flashing. 2-stroke world championship | 150cc & open pro results (updated) MXA GUIDE TO YAMAHA YZ250 TWO-STROKE JETTING (1999-2021) THE REAL DEAL! 2021 MOTOCROSS ACTION 450 SHOOTOUT VIDEO idle or when sitting level and the engine is not running. If I start it and put it in gear as soon as the advanced idle period ends, I can run through the midrange and at WOT no problem. 5 turns, moved up a half turn and down a half turn on each carb with no luck) and it still idles low on choke at 2000rpm steady and still won't idle with the choke off. All sorts of brands too (for instance, Stihl, Homelite, Shindaiwa, others). At first, even at full choke it wouldn't start. I have a 2005 Johnson 90HP 2 stroke on my boat and when I have been idleing for a decent amount of time or running at low speeds and go into idle it idles rough and then cuts off. It seems to have a miss at idle and backfires in the exhaust manifold. Depress accelerator pedal to floor (WOT). Sounds like a slight miss and revs drop a little every 10 seconds or so. Joined May 22, 2018 Came out to work on it a little later and sprayed the throttle body with wd40 and adjusted the throttle cable a bit as it had a lot of slack in it. Got it up to 44 on a drag. USUAL CAUSE. Seems to have somehow put itself into limp mode. When I first cleaned the original carb and started the atv it ran good. When idle timing is set- go back and check the idle mixture again at idle of 725- and then recheck the idle timing at 8 degrees- this is in case the idle mix was way off on the first check. 94 NA Supra will start, Idle, but wont rev past 3k RPM. High performance 2 stroke engines are very inefficient at low RPM and therefore it is usually best not to set them to idle. This engine has 16 hours on it and I have a parts engine with 268. anyone have any ideas why this might be? you can open the throttle as much as you like and it won't rise above idle. New spark plug. Also, inspect your MAF sensor for dirt and wear. 9 wont rev at all. If I release throttle then the engine dies immediately 5. Bike idles, but won't rev. Basically, shell start up fine and idle around 1500-2000 rpm (full choke) but upon going to 1/2 choke or giving her any throttle, she dies. Forum Main Tech Help/Race Shop 2-stroke jetting for dummies. He had one on the bench that would start and idle, but would die after 30-45s. The Theory of Air-leaks It's a common problem, especially on cylinders 2 & 7. When you throttle back however it will stall immediately unless you can catch it with the choke and jockey back and forth. It idles fine and reverses fine but in forward and under load it only runs quarter RPM and slow with the throttle at full. So, your outboard won’t start. Not fun or safe in a river with fast current. Suspect fuel starvation. In general, the oil-to-gas ratio for a two-stroke engine should be 1:50. The only other thing that comes to mind is the ECM or electronic control module. 5k and it idles just above 1k. Turning the fuel screw all the way in will not stall the engine. I bought a BR550 online and it was supposed to run good. If yours has a plastic grommet, you can stick a piece of weedeater string in the small hole. Because you can get it to full throttle though I agree with you. Discussion Starter • #1 • Oct 3 Theoretically if the engine is turning exactly 800 rpm, each spark plug would fire exactly 400 times. 1 Answer. Any air that can The bike hasnt been running to my knowledge for 4-5 months. facebook. To adjust the low speed mixture; Start with a fully warmed up engine at normal operating temperature. When it's unplugged it runs perfect idle start in neutral using about half choke and it will rev up quite nicely. Check the air filter and clean or replace if needed. What are the likely causes? What should you check first? Second? Third? It doesn’t matter what brand of outboard you have or whether it’s 2-stroke or 4-stroke. I have same issues, didn't make it home Friday night. One is assuming: 1/ Clean fresh fuel 2/ Engine healthy (if it gives full power assume no hardware issues) On top of other considerations, the oil pump of a modern two-stroke may not work in reverse, in which case the engine suffers oil starvation within a short time. Starts and idles awesome, but for some reason it doesn't want to rev past about the 1400 RPM mark. Won't idle ~500 rpm's according to tach. 08 inch Engine will start but not rev up. An air leak upstream of the carburetor will not affect the idle speed. To test, jiggle the choke plunger knob a bit next time idle shoots up. NOTE, if it won't idle for five minutes you may have other issues. 1; 2; First 2 of 2 Go to page. 1; 2; Next. I cleaned out the deflector and exhaust area (really not that bad) - no difference. I'm having an issue with my idle. Currently, there are 0 users and 1 guest visiting this topic. Typically, 700 rpm is a good starting point. 03 r1 idles rough wont rev. Shake the gas and oil for one minute before putting it into the fuel tank. You may also have an air leak in the intake tract causing the lean condition. Since you cannot go above 1300 rpm, that rules out your TCI ignition not advancing, as a cause of your problem. The bike won’t be up to full operating temps, so you have to click down into first and putt around on it. Yes,when the sled is cold the sled start fine,after a few moment when it's warm up and act like it's running on 2 cylinder and end up stalling,but if i give a little throttle it will rev on 2 and start running on 3 cylinder. sputtering makes it sound rich. An air leak in your crankcase will cause a lean fuel mixture which in turn can lead to a fast or erratic idle speed. If your fuel screwis in further than 2 turns, you need a leaner pilot. wingzero186 · Registered. Problem occurs on no wake areas, I run a little faster than most to keep motor running not stalling. I have a 1999 Ford Ranger with a 2. It planes around 3000rpm and seems happy to run there. Prev. Discussion Starter fitted new genuine needles and emulsion tubes tonite and my valve still wont rev out when connected to the airbox , but goes great when its not. I have been doing a lot of testing and research and what the industry doesn’t want to say is that in practical application 4 stroke outboards do not produce as much Idle mixture on 2-strokes have to be a bit fatter than 4-strokes to allow just enough 'richness' for acceleration. Pumping the accelerator will get the engine to rev up, no problem, but it's hard to get it to stay there. My brother in-law had it on loan for a few years and I just got it back to sell on. The crankcase seals I was talking about are the ones between the crankshaft and the crankcase - one at the bottom above the blade plate, and one at the top under the flywheel and magneto. 6mm) and the other has a bore/stroke ratio of 1. Jump to Latest Follow 1 - 12 of 12 Posts. Fully built bottom end and supercharged here. If percentages are as specified, check all connections. I always leave mine idling for 5-10 minutes before I ride, but I don't really understand The most common sympton is the clyinder with the bad seal wont fire at idle, at higher rpm the cylinder will kick in. Lubrication of two-stroke engines is effected by mixing two-stroke oil with gas before use. The damage can be severe, in an engine that does not have anti knock sensors and computer controlled ignition timing- But on the 1990-2001 - 8HP (8-HP) 2-Stroke & 4 Stroke 1993-2001 - 9. ) It will start, and idle. Sled starts fine, then idles down to barely running. However going from a 2 stroke to a 4 stroke I would advise a 50% jump in power. redbullfps · Registered. Very tough to keep running and not have the engine idle at high rate. 2 stroke idles all day but won't rev !! Off Topic Section. When I tried to start it nothing. Power valve cover taken off and actuated by hand, feels smooth Pull the throttle assembly out, (easy to do, just three bolts or maybe it was two). Other Vehicles. The seals are just plastic, pushed into bored recesses in the crankcase halves. Piston splitting the cylinder or rod coming through the oil an oil pan is as bad as it gets. Seems to throttle up fine. After starting the motor, it will idle rough and acts like it wants to stall. When the mixture screw is less than 11/2 then the Idle jet is too rich (too large). 2 strokes are simple,if it's got spark and there's good fuel in it and it wont start it probably needs a carb kit. (70cc) 2-stroke 1989, 3 hp 1 cyl. I am torn on what to do here. flyhunter3825 · Registered. Horizontal Minerelli motor. 06 and 0. If it starts with throttle, but won't idle, blame the idle adjustment and or fuel path. I have a 1997 c40tlrv 40 hp 2-stroke, 3-cylinder motor. It does not smoke, skip, or anything like that - just seems to get revved up to about 1/2 speed, and won't rev no higher. When I initially start it, it will start right up, idle fine for 2 or 3 minutes after which the revs will start to go high followed by the engine dieing out. It hits a certain rpm and just starts surging like in the video. Clean or replace the spark plug. If i start my bike up it idles ok for about 3-4mins at 1200 rpm. The engine idles too high. This will allow the saw to come to operating temps. If percentages are not as specified, turn ignition off. 2. Clogged air filters have been shown to reduce your gas mileage by up to 20 percent. It has always been reliable and performed well. Take the carb apart and spray out all of the jets with carb cleaner and it should fix the problem. Mercury 9. 3mm/136. . Recently, I have developed a problem where it will hardly ever stay running at idle. When a bottom end is puddled, depending on how bad it is puddled, a 2 stroke wont normaly rev up untill it is cleared out. Also another saw won't even fire - good spark + gap OK + new fuel. < Previous Thread | Next Thread > Mark C New Member. . Go. Am getting the following fault codes: P2187, P0441, P3138, P2008 I reset fault codes and the CEL returned after 100kms approx. 5 turns and open the throttle to 3000rpm it stays there and then the engine dies like it just run out of (ii) The idle jet is the one closest to the idle mixture screw (which is at the back closest to the engine), take it out so you can clean the jet itself. Above 2000 rpm all the way to 5400 rpm she runs great! As soon as I pull power down to below 2000, she wants to die, unless I start using the key primer New plugs New It does run much better but still won't idle. Wow I did not know the image would be that big. Rebuilding a two-stroke engine’s top end includes servicing the cylinders, pistons, rings and related gaskets and O-rings. Improper 2-stroke carburetor tuning will have a much more significant effect on a 2-stroke engine than a 4-stroke because the premixed oil lubricates the crankshaft. Carb was cleaned about a month ago but not since the accident. 6mm Rebuilt the carb completely. We just bought this motor. Low and behold the timing was now 45 degrees off, when i had it perfect last night before i took her to the Rough Idle/stall/won't rev up I have 05 f250 192,000 mi. I installed a new spark plug and air filter- no difference. idles fine but won't rev up under load gets boggy. throttle plates closed is highest. It sounds like your water passages are clogged up with either mud, silt, or salt. If I turn choke completely off then the engine gets weaker and weaker until it dies 6. Victa 2 stroke wont go above idle #20772 27/12/10 12:40 PM. on March 12, 2017. If there is an air leak i would expect it to come from around the choke as earlier in the thread you said that if you pushed down on the choke the bike ran ok, so you may want to consider replacing the choke unit with an auto or manual one. Try unplugging and plugging them in, see if anything changes. What gets me is it does the same thing with the new ,not rebilt,carb. Bayou 220 idles great, but won't rev. Adjust each carb to best idle + 1/8 to 1/4 turn, ideally, adjust out on the water a blade width at a time each, just until any throttle hesitation is gone. 5S 125000km Recently I did a DIY oil change, transmission change, and now throttle body clean and replaced spark plugs I just cleaned my throttle body and changed the spark plugs. Been through throttle bodies, new plugs, new battery, fuses, and swapped the relays. 2 stroke idles but wont rev