2 stroke slow return to idle branded sub standard 2-stroke oil. We got in ok but was a little nerve wracking. If I keep it in gear and just let out the clutch it will then calm right down and stay there until I start ridign again. When It's slow to return to idle, and has a hard time idling below 2000rpm. After the saw got warm and i made some cuts (very quick cuts ill add). 7L Power Stroke Diesel; 6. Hard to twist for acceleration means your Since I work on all sizes of engines, I bought a handheld, inductive, tachometer recently. Thread starter lmbr; Start date Jan 1, 2024; lmbr Seaman. They were all set at 1-1/2 turns out. The problem I noticed is that at slow speeds like 10 to at most 15mph the bike revs at high rpms. Usually if the seal fails on the clutch side that pipe will smoke excessively. Darrie · The engine refuses to idle. check the throttle valve cutaway is the correct size The problem is a slow return to idle . Same problem with correct new sparkplugs? New gasoline at 50 to 1 ratio using ONLY a real 2 stroke / cycle oil ? Rated as tc-w3. I guess that there could still be a crack in the manifold on the enhance off-idle throttle response for drag racing starts. Screwing the idle mixture screw in or out will slow I'm currently trying to set the right fuel/air mixture for our 50cc Yamaha Jog R (around 2002) air-cooled 2-stroke scooter. bikedork. Set high idle so plane just starts to roll. Members; A leaking left side crank seal could cause the engine to suck air and lean out, which of course can make a two stroke slow to return to idle. Found a few sources claiming a hanging idle can also occur when you're too rich, because of excess unburnt fuel. Of course any air leaks will cause this as will a lean pilot circuit. A simple way of doing this is to set your idle low enough that the plane doesn't roll. Probably good enough for a 2 cycle. It has always been reliable and performed well. If you are riding and accelerate, reduce throttle, it will keep right on going for 3 or so seconds. Motor runs fine above 1500 RPM but stalls below 1200 and will not come to idle. Nothing like the precision two strokes from 1984 on. 21 - 30 of 30 Posts. You might find that there are two or three pilot jet/airscrew combinations that will give a good idle - for example 30 jet and 2-1/2 turns, a 35 jet and 2 turns or a 40 jet and 1-1/2 turns might all idle fine. Now the exact opposite. almost as if the bike was cold but I had just rode 45 min from the shop. for slow leaks always suspect your test fixture is the source, triple check all the fittings, use plumber's paste / tape on threads etc. I use CHEAP ACE 2 stroke oil with no problems. Novice do it yourselfers pull T-stats out because they have gone bad and do not want to wait or spend the money for a new stat. I had a '79 Suzuki that I rebuilt the carbs on and had the same issue as you. Seems the carbs are very sensitive to idle screw setting 2. Carson2000 New Member. My local mechanic plugged in his diagnostic machine and the graph tach function would show the I've got a hanging/slow return to idle that usually goes away if I blip the throttle. 3l not returning to idle? - I'm stumped. otherwise runs great. Slightly lowering idle back to 900 rpm stops the behavior. Past 1/4 throttle ski operated On a 2 stroke the crankcase needs to be sealed. We used to go to . 3L Power Stroke Diesel; Slow return to idle. The idle speed will likely be around 1200-1500 RPM, but you just have to set the 1983 - 2012 Ranger & B-Series - 2. When riding hard it takes 3 - 5 seconds to come down to idle. Recently, I have developed a problem where it will hardly ever stay running at idle. I turn on high idle, fly around and do whatever, and when coming around to land I flip it back to low idle. ^start there, it is easy and free. Honda 2 Stroke ; hanging idle Facebook; Twitter; Youtube; Instagram; Pinterest; Whenever I run into this type of a hanging idle it seems as though its a balance between the slow jet and idle setting. Jump to Latest 65K views 58 replies 13 participants last post by SportsterDoc Feb 26, 2018. Joined: Aug 2007. Fair compression, runs smooth. spark advance sets idle rpms. You wanted the motor to die rather than sucking in gobs of I have a 2001 YZ-250 and on a cold start-up, the idle speed is quite high - enough to make me wince. Must be something in common with both 2 and 4 strokes?? I just ordered a set of Boyesen reed valves (not used on 4-strokes of course) in hopes of correcting the problem. have to keep fast idle around 1500 rpms to keep motor running. Been on jury duty but plan on trying to figure that out today. 035 plug gap, but the flame front is larger and they tend to idle smoother, longer. 035 on my carbed 200 'Rude, also with 100% synthetic and good 87 octane. When i first start the motor it revs up for a min or two and the drops down to a idle like normal, but then when i step on the throttle take off it only drops to a high The engine will then idle, but the speed it idles is different on almost every start. From day one the engine had a bit of a ringing sound in idle - no big deal. I can start it and The goal is to get your 2 stroke bike running the best, and the goal is to do that with the air screw between 1. im probably making it sound way more complicated then Re: Slow return to idle Bill The low speed adjuster is about 1 turn out and the high speed is 1. If rev are normal then it could be advance unit ,if rev are still high not advance 2 Stroke Bicycle Engines & Kits. There are two nubs that form a notch that is used to keep the original carb vertical but impedes the VM24 from getting a good seal. OP In Remembrance OP Curmudgeon R. Idle adjustment on 25hp mercury 1998. I have the wife pump the ball and or choke the engine to keep it running. I have a 07 fusion 2. It has new intake and exhaust gaskets with a foam pod filter. 16oz to 6gallons (50:1 ratio). I turned the idle speed up by ear and that helped a lot. If I pull in the clutch lever, Rev the engine 1/2 or Most people say to use a bigger idle jet if the air screw is less than 1 turn, and a smaller jet if it’s more than 2 turns. 9 4 stroke for a pontoon boat 4 years ago. Joined Apr 7, 2012 Messages 6,129. 5 open then get on the water and punch out a hole shot. If your outboard engine Stock CRF50 slow to return to idle. This will stop the engine from going into slow mode if the engine is overheating. 0L Powerstroke Diesel; 6. I did it anyway. 1 2. you must realize while yes there are many variables this igntion system was 2 idle: when the engine is at tickover, with the throttle rotor closed, the pilot jet the top of the needle, the four stroke version has 2 identification rings). While I am intimately familiar with the 4. 5s 100s A 8As need to idle around 1200 . The reason was that we ran open intakes, and when you drop the bike, the carb inlet is 2 inches from the ground. It will read 2 or 4 stroke engines and several numbers of cylinders. it is absolutely confirmed it is unrelated to the resting on the idle setting stop screw. A carburetor cleaner will do the job. 2L Power Stroke; 3. I picked up this engine about 6 months ago and have so far been unsuccessful in getting an idle issue fixed. Just idle and then cut. I know nothing about EFI. I have a 1992 F350 460 4x4 manual, Starts and drives fine cold or warm. KTM 2 One day out of blue, engine would not stay running at idle, coughs and chokes and sputters and dies. Above 2000 rpm runs smooth and will run wide open just fine never missing a beat. 930 idle after startup idles really high at proper TPS setting. This means that if either the transmission or the engine are spinning fast enough after it Turn in the slide stop screw for a slightly high idle speed. But, when I I adjusted the cables and magic perfect idle again. 003 "approximately" and it runs a bit more stable, but when I let it off the throttle it's slower to return back down idle than what I remember it doing. 05-28-2023, 01:04 AM #5; advancing the timing by up to 4 degrees* on a banshee is always a gain and is confirmed on dynos ,you wont lose power on this model at this range . It will carbon up the pistons and rings. As said earlier, I had faulty idle screws, the tips had corroded away. throttle stop screw - slow 4. I don't know what it 2009 Gen 2 - Once letting off the throttle the bike will hover at a high idle (2-3k range) for several seconds. I have opened up secondary idle screw to be able to close primary down back on transfer slot & redone mixtures to fix the problem of being so rich at idle. A tip on the weights determine if the mechanical advance is the problem is to warm bike up return throttle to off hit kill switch then wait till engine completely stops and without touching throttle crank bike. However, in the aftermath the bike is now slow to return to idle. Old Victa 2 Stroke Idle Problem #28278 04/09/11 10:00 AM. I have been around the block a few times on it and its slow to come back to idle, it idles and starts on the button but the plug looks a little on the rich side. The throttle snaps shut and the I took it back to all stock jetting as a base line to work from so now I am real close at 2 3/4 turns out on the pilot screw and it wants a bit more to be right as 2. 2009 sr50r So opperator feedback is low. Now it will not idle when in the water or in a tank. 15 hours on rebuildhas always been a little slow to come back to idle but seems to have gotten worse. RIght now I have it where it feels perfect when riding (168 main, DDK #3, and 42 pilot). Had them replaced and fixed the problem for a while. It used to snap back closed. G. Had a mechanic tell me that a Optimax will do that but it has a part to allow it to keep running. "I own a 150hp Yamaha 2 stroke "I own a 150hp Yamaha 2 stroke Salt Series that runs great at 1500 rpms and higher. In these cases use the combination that gives the best response when the throttle is suddenly opened from idle to 1/4 - 1/3 open. Hi everyone, I have this problem with my old Victa 2 stroke 160cc lawnmower, it's the one with the back plastic carby on the old full crank engine. If the ignition (points) are on the end of the crank on the right side, it won't be too hard to change the seal . The pilot and airscew are giving me 94' Yamaha 115 2 stroke won't idle 08-23-2011, 11:17 PM . Apprentice level 4. If the idle actually hangs and then drops, you have an mis On the Zeda 100 when I release the throttle with clutch pulled in the idle stays very high and takes a long time to lower. Sounds strange, I know, to have a spring backwards. check the timing advance arm goes back to the idle stop screw ok . Or a combination of both will cause that also. 75 were all getting noticeably better. Bike runs and idles ok although the exhaust does pop a little but im unsure if this is normal with it being a two stroke. RPM slow to return to idle #729479 03/21/18 10:46 pm Joined: Aug 2001 Posts: 448 Texas Gulf Coast Curmudgeon R. I have my idle speed adjuster backed out completely after 5 min. My 2003 YZ250 wasn't lean enough to bog on small throttle inputs, but it returned to idle Basically tightening the screw allows less air through the box, opening it up allows more. 5 to 2. the reason for the delay (or slow) return to idle is to help reduce hydrocarbon emmisions (unburned fuel) Return to idle behaviour is much nicer and more consistent now. if i go through this starting process and leave it run at 1500 rpm for I have an RM (KX)100 that has an inconsistent idle speed. In fact today, it actually stuck open at about 2000 RPM and no matter how many times I blipped the like others said, first thing to try is simply turning the air screw. Probably on average of once a day, when I shift from forward back to neutral, rather than returning to the normal idle of 650 rpm, the motor accelerates to what I will call a "high idle" of around 1100 rpm. Really sucked when shifting as you could feel the clutch dragging the engine RPM's down to match the next gear. Any help thanks. After running down the trail I come to a stop and I have a hanging idle. 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. This leaves the fuel system at fault. I have to use the Yamaha 2 Stroke ; Knock only at idle Facebook; Twitter; Youtube; Instagram; Pinterest; Newsletter; Knock only at idle. In 1986, two (2) different 40hp models were built. It is still suffering from the slow return to idle that was there with the old pods. Make sure the idle cable isn’t catching on anything preventing a proper return. Possibly ‘engine is slow to On the TPI models, the "idle" adjust knob they are referring is actually an air bypass adjustment (KTM locked the actual idle screw on TPI models using red locktight for emissions). Had to make an offset intake. P. plastic connector shoved in carb with silicone, o Well I've been reading around and found pros and cons to both sides. My air screw is 2 1/4 turns out. Also, the RPM consistently drops to around 500, and then goes back to normal while idling. Understanding why your 2-stroke engine won't start is crucial in resolving the issue and getting back to your activities. It's just a little annoying. My idle screw is however is almost As far as vacuum leaks go, I capped off of the vacuum lines at the manifold with no difference ie slow return to idle. In the second case, where the engine bogs on opening the throttle, it sounds like your idle jets are all plugged up because you didn't know about the tiny idle mixture ports and didn't run fuel system cleaner The checklist for an outboard that remains running poorly at idle is the same as for when it stalls while idling. Darrie · I'm currently trying to set the right fuel/air mixture for our 50cc Yamaha Jog R (around 2002) air-cooled 2-stroke scooter. I ran numerous 2-strokes in my career. 2005 cr250 with a keihin. I would only use OMC or Mercury branded 2-stroke oil. When I press the gas pedal it takes about 5 seconds for the old girl to return to idle. I gave it a valve adjustment with what I had for tools . Hi Turtle, had a similar problem on a 30 yammie 2 stroke fuel, auto oil mix. I posted this last Oct My son races an 02 cr250, mostly stock, fmf pipe, recently added a shorty silencer. I have a 1997 c40tlrv 40 hp 2-stroke, 3-cylinder motor. Line up your plugs 1-2-3-4, take a similar picture of their tips, and post it here for us Re: Mercury 90 HP 2-Stroke Rough Idle and accelaration Idle mixture on 2-strokes have to be a bit fatter than 4-strokes to allow just enough 'richness' for acceleration. 1978 GS1000C 1976 GT550 ongoing money pit. I've checked the cables and there is nothing Old two stroke motors have very slow rpm reving to begin with. fast enough to stay running, slow enough to prevent gear clunking. it runs fine and has been returning to idle ok now it takes a few seconds to idle back down. The pump stroke is supposedly not up to the job, I don't see a reason to If the idle speed increased, adjust the idle speed knob to return the bike to a real slow idle speed. This can happen with any engine irrespective of its age, Re: Disable/reset SLOW on 95 Evinrude 25hp 2 stroke With the engine off disconnect the temp sensor. (You'd have to see the stuff to understand. Any help sure would be appreciated. This lack of seal causes erratic idle as it leaks air into the pilot circuit. Out of the tank it idles at about 500rpm and it idels without fail. However, there's one more thing you can do to troubleshoot an outboard that runs Trying to break in my new 15hp 2 stroke Yamaha but it seems to be running too rich at idle and stalls after a few minutes of running, no problem at high speeds. The main and pilot look just like 2 stroke jets, i bought the bike about a year ago Tuning a carburettor on a two stroke is probably one of the most important jobs to get correct, but can also be the most difficult. Some great sources online So just picked up a 2022 kx85. Most of the time, the air screw is set about 1-1/2 turns out from fully seated - this is a good base line starting point. I've ordered one of those cheap inductive tachometers to measure my RPMs (the manual states it should be set to around 2000 RPM at idle). Re: 2002 40hp Mercury 2 stroke knocking noise By removing the wire from the plug it should be running on 2 cylinders and increase tremendously in RPM when replaced. Compression is 120/120. I just came back from the lake and was able to get the motor to return to idle quickly and it idled smooth. This lasts until the motor starts generating some heat - maybe 45 seconds or so. Most people say without any mechanical issues, a hanging idle usually means you're running lean in your idle, or even partial throttle circuit. I've The RPM is very slow to return to normal idle after releasing the gas pedal. it an air screw but then called it a fuel screw because its a 4 stroke bike but now found out its a carb made for a 2 stroke and its on the Slow to return to idle Hey folks, its an annoying one this. Seems the carbs are very sensitive to idle screw setting. Keep in mind this can vary from boat to boat and change with situations in the boat. I say that engine idle will be fine over a wide range of idle jets with the air screw making the needed 1983 - 2012 Ranger & B-Series - Slow Return To Idle - Greetings from your newest Ranger owner. I did set the idle down to approx. 9 2 stroke. It now wants to stall out sometimes when the rpm drops I also did a decarb at the ramp. Then turn the air screw back and forth to find where it idles the highest. ) Carb slide is still polished to a mirror Re: hesitation/stalling on slow acceleration I own a 2006 Yamaha 25hp, 2-stroke that experiences the same condition as you. It revs up, starts dying down, then idle on a really really low RPM for a second or two where you'd think it will die now, then it recovers to a more or less stable RPM again for a couple of seconds before starting to surge Still my main focus in all this is the failure to return to proper idle idle sometimes on the all stock 2016 here at first. I. The only way I found is for the later engines with the cable. 3 Duratec slow to return to idle My 2011 2. My high idle is about 800-1000 rpm more than my low idle. Fusion Member ; 7 Share; Posted May 7, 2010. Unlike Works well on 4 strokes but is pretty much worthless on a 2 stroke. The plugs seem to oil My throttle is very slow to return to idle when I come off the gas. C. Joined Jun 24, 2012 Messages 69. The idle has me perplexed. Understanding the Basics of a 2-Stroke Engine It's important to understand how a 2-stroke engine operates. It was bogging down in various gears My mechanic adjusted the carburetor and restored full power to all my gears. Turns out, I had 2 springs on two of the four carbs backward. I do not have a cable. It stalls out because fuel is not getting to the carbs. I made a few minor carb adjusts to get it to idle nice and rev quick, 4 stroke slightly at WOT. Another common culprit of outboard motors dying at idle is water getting into the fuel supply. idle Plug chops. Motor fires right up when high idle lever is lifted but likes to die within 10-45 seconds of idle or extremely low rpms (in gear). 3L/2. If the idle actually hangs and then Today I’ll be showing you guys how to get a good idle and crisp throttle response on a 2 stroke! Subscribe! My son races an 02 cr250, mostly stock, fmf pipe, recently added a shorty silencer. motor will start with choke on, off once started. The reverse works, TPS seems to Fuel Injection, Carburetion & Fuel System - EFI- Slow return to idle(why?) - Hey All!! Its an 88 F-250 4x4 with a 302 EFI 5-speed. Starting it at high rev then putting into gear the motor stalls. 15 hours on rebuildhas always been a little slow to come back to idle but seems to have In a scooter, the engine spins a clutch which then connects to the transmission via centrifugal force. 5L ; 07 fusion slow return to idle Welcome. Grounding the tan wire will actually cause the engine to go into slow mode. We mostly ran Mercs. Posted September 8, 2017. Any help sure would be Carb is 750 aed dp,has holes drilled in butterflies( to help idle air flow without being above transfer slots???). When riding runs great, jetted by me with spark plug checks. Internal combustion engines (ICE) rely on controlled explosions to work. ) Lean the idle mixture and set the idle speed accordingly. Recommended Posts. Re: Slow return to idle Bill The low speed adjuster is about 1 turn out and the high speed is 1. Turn the idle screw in and see if your dirt bike Re: Trolling With A 2-Stroke Salmonseeker, you may see some additional wear on the . In the tank or water, it just stalls. The slow return to idle may be an air leak at the carb manifold. I have only had it for a short while and when I first got it it was a very slow idle, rough but it still idled. I never found it to be the main jet or needle select but the return to normal 15 seconds or so after shutting the throttle sounds like a 1973 - 1979 F-100 & Larger F-Series Trucks - New Carb - Engine slow to return to idle - Hi all, I just swapped out my 2150 for a new 4 bbl summit carb and intake (78 F250 with a 400). Those 7. Some causes are very easy and quick to fix, but some bikes require a little more If your 2 stroke dirt bike has poor throttle response just off idle, it's not only going to be down on power, but it's going to be harder to control because it won't accelerate smoothly Malfunctioning Throttle Return Spring: If the throttle return spring is malfunctioning or broken, it won’t be able to push the throttle plate back to its closed position. '05 KX85 w/103cc engine '97 DR407 '83 CR60 '05 TTR230 Stock CRF50 slow to return to idle. Turning the screw in, you you keep turning it clockwise until the engine slows down too far and gets Hi, as the title reads anyone that can help it will be appreciated I just started it the first time and left it to idle about 2 minutes it idles normal then gives one long high rev till cut out. Would slowly return to idle. It ran smooth and was relatively easy to start. If you find it does not stall with the larger jet but has to be open more than three turns with the smaller pilot jet, put the larger one in and set the fuel screw at 1/2 turn. You must then re-visit the fuel screw. It is a 2011 model 150 Optimax. Posted December 15, 2011. Re: Running hot at Idle & Low Speeds - 90hp 2 stroke Yamaha When you remove the thermostat it prevents the motor from reaching the proper operating temperature, typically at idle and lower speeds. Fast idle speed is 1500 +/- 200 RPM. 0 and 2. Boat owners who have been using a 2 stroke outboard engine might sometimes experience a power loss when running their boats at full throttle. My buddy,s out of town with the hand helded Stock CRF50 slow to return to idle. bike shop was also I have a 1983 evinrude 9. I see in the Service Manual, under General Specs, that WOT should be 5000-6000 RPMs. Richy Yours is at 60% and mine is only 5%. Not sure if it's my imagination but Skip to main content Open menu Open navigation Go to Reddit Home r/klr650 A chip A close button Log In Hi all, Ive been working on my 2006 beta rev 3 trails bike for days now trying to find the cause for an issue im having. I was born with nothing I did the . By nella1, May 7, 2010 in 2. Slow or no return means your idle cable is too tight. Welcome to the Ford Fusion Forum Sign In; or; Sign Up; 07 fusion slow return to idle. I'm am wondering if it is the carb I need to adjust and if it is the carb what adjusting should I be doing. Runs and rides fine and feels good. Carb guys, what causes the hanging slow return to idle o the vv carb on a quick blip. The 2. I recently had the carb stripped and cleaned on my 1993 merc 2 stroke, it runs fine now but the idle is really high and I have no idea of how to adjust it? I wonder if the throttle remote lever or cable assy isn't allowing the throttle at the carb end to fully return to the idle posn. Jump to Latest Status Not open for further replies. 457 posts · Joined 2018 Add to quote; Only show this user #1 · 2 stroke dirt bike idle RPM. Whether you have a 2 stroke or a 4 stroke, if the idle adjustment is set too low, the engine won't stay running. run time ( though it must be adjusted correctly for the, cold, motor to hold it's idle ). Hard to twist for acceleration means your enhance off-idle throttle response for drag racing starts. ebxr8240. If it does there is build up and makes for bogging and possibly a fouled plug. The basic principles for 2 stroke tuning of carburettors remains the same 250-530 4 Stroke Enduro ; slow idle return on 07 450 EXC Facebook; Twitter; Youtube; Instagram; Pinterest; Newsletter; slow idle return on 07 450 EXC. Vacuum Leak: Check Today I’ll be showing you guys how to get a good idle and crisp throttle response on a 2 stroke! Subscribe! My KTM 300 XCW TPI has developed something that causes the throttle to slowly return to idle. That way you have a little bit of adjustment both I’m working on a Yamaha pw50, i’ve cleaned the carb countless times and it looks brand new, i’ve replaced the plug and air filter and i have a coil pack on the way. Replacing the spring can fix this issue. Its a 2022 but does look like it had a serious year on it before I got it. With a 4-stroke, it may be a timing/advancement Solution: The only solution to dirt accumulation is cleaning up of the carburetor. 900 out of gear. 3 Ranger with a straight drive (manual to you non-southerners) would take 3 or 4 seconds to return to idle. Actually getting some dripping off the pipe so it is actually a bit rich. Now it is perfect on repeated quick blips but if left to idle for 15 or 20 seconds it has a just pinch of hesitation, so a 1/4 more I think, that would be 3 out. By Scottwr12345, September 8, 2017 in Yamaha 2 Stroke. 4L with 102,000 miles. I have search this forum and the 3. (Edit: Cable-) Housing is in good condition, little slow to return off of idle, but slide DOES return all the way down. Past 1/4 throttle ski operated Hi, I have a Yz125x with the Mikuni carb. Oct 25, 2015 #1 So I completed building my first motorized bicycle. I'm working on my 1986 Mercury 9. Thank you for posting to AskMechanics, Blue-Krogan! If you are 1983 - 2012 Ranger & B-Series - 2. Walbro 2 stroke carburetor explained. 25 to 2. I found something out that might be really important. I have the idle screw all the way in, yet it doesn’t see to want to idle, it dies instantly as it gets to low Back when I road raced two strokes, we never had them idle. The engine is great at anywhere from 1/4 to full throttle. Victa Cortina 2 Shed Find by Return Rider Hi, Have a 78 B with Zenith Stromberg carb, have great response when cold returning to idle but when at normal operating temp it takes up to 7 seconds for rpms to return to idle. one with one (1) carburetor, the other with two (2) carburetors. If the idle speed increased, adjust the idle speed knob to return the bike to a real slow idle speed. I'm sure many people know this but for those that don't from what I understand if it doesn't idle, if your drifting downhill there is no lubrication. -> My carb has a pilot air screw and an idle speed screw. d. It did not do this until I had recently synchronized the carbs and set idle to 1000-1100. By bikedork, December 15, 2011 in 250-530 4 Stroke Enduro. 2] needle jet (the four stroke jet has a small horizontal drilling through the 2. After a couple of seconds idle RPM becomes very unstable. 6384 posts · Joined 2001 Add to quote; Only show this user To some degree this may be normal. But while driving and coming to a stop light Make sure the idle cable isn’t catching on anything preventing a proper return. 710 v baseline TPS setting and . That setting is À 2 stroke or 4 stroke dirt bike that won't stay running is actually a fairly common problem. Prev; 1; 2; Next; Page 1 of 2 . Changed spark plugs, ran double dose of quickleen in 50 gal tank (lots of white/black smoke from this, more than normal). I was born with nothing and still have most of it left. Tried readjusting fast The manual states that idle is 675 +/- 50. Keep doing this till the fuel screw is opened just enough to provide a nice steady idle at the lowest possible RPM. Posts: 386. 4L Power Stroke Diesel; 6. 780 v, but it is very slow to return to idle after revving up. Would idle, then after a fast run, if I slowed too quickly and try to idle, motor would choke on it self and cut out. 5 turns and open the throttle to 3000rpm it stays there and then the engine dies like it got this project put together today. In general, a FOUR stroke carb has an Air Screw adjustment - which will be on the manifold side of the carb slide. The rpms stay high when I release the throttle for what seems like atleast a minute. 5 turns out, according to the Mikuni Manual. Save Share Reply Quote Like. I am not a mechanic which will become very obvious as I ramble on. It takes about 8 seconds for the idle to return to normal. It is a bit worse when I turn the bars fully to the right. I've adjusted it as much as I know how As far as vacuum leaks go, I capped off of the vacuum lines at the manifold with no difference ie slow return to idle. When the tiller handle is moved Hi, so my two stroke has had a bog for a while and I finally decided to re tackle it after finishing a different project bike. Not ideal. 0L Power Stroke Diesel; 1999 - 2003 7. Posted May 7, 2010. 040 and found the same thing your are wear-wise, so I stick to . I have searched this forum and I have a service manual and I can not find how to set the idle speed. nella1. 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. It seems to mostly do ok on quick throttle chops but hangs at a high idle when coming down slowly and gently with the throttle. Share More sharing options Followers 0. A 2 stroke dirt bike should be able to idle if it’s properly jetted. Usually there are other issues that prompt the owner/mechanic to set the idle too high but the actual root cause of the hanging idle is the throttle stop is set to allow too much air, effectively preventing the bike from returning to idle. Since most guys save money by doing both. Just recently got this one. Victa Cortina 2 Shed Find by Return Rider Re: Need help. After being revved, the motor does not immediately return to normal idle speed, it hangs high for a few seconds then it slowly drops to an idle, but then after a while slows down again and stalls. I just bought it 2 weeks ago and have noticed that when I rev the engine it is very slow to come back down to idle. I wonder if that might account for why your idle is so slow to decline, since Derivative gain opposes fast changes in rpm. The engine started with the screw open 2 1/2 turns, ran very roughly until it was tightened to 1 1/2 turns, which 3. This engine is mounted on a glastron 16 foot fiberglass boat. Melbourne, Victoria, Australia. You do need a spot on VE and timing table around idle though. My throttle is very slow to return to idle when I come off the gas. Will start and run at fast idle but when I reduce it, it dies. To test, jiggle the Nothing like the precision two strokes from 1984 on. It does this every time. I have a very erratic issue with my Optimax 150 (2 stroke, fuel injection). It is very noticable when 2 stroke won't idle. Takes what feels like forever to slow down. I do not bother with other posts I find nothing. No blipping of the throttle. 0L engine, this Ranger is a 98' 3. Keep in mind Removing the slow idle screw and spring, and rinsing screw and threaded hole with fuel may have helped. I purchased a used Sea Hunt 186 with a Yamaha 115 2 stroke both 2003 at the end of last year and launched on Saturday Jun 6 2015, with fresh high test gas. . 9 2-stroke and trying to nail down the specs for RPMs at Low Idle, High Idle, and WOT. I made adjustments all the way out to 2 turns and noted no improvements so set them all back to 1-1/2. When i first start the motor it revs up for a min or two and the drops down to a idle like normal, but then when i step on the throttle take off it only drops to a high idle for a min and then drops all the way down. Make sure your bike is very good and hot before setting it, not "oh I let it idle on the stand for 10 minutes, it is hot" If you do it this way when you ride the bike hard and it gets truly warm the issue will return. Let me say first, that when I bought it used, it had a tendency to die at an idle. Tried readjusting fast . Today, I decided to try it on my Nomad. Tried tuning the idle air jets out with no improvements. It kind of idles if you carefully adjust the mix and idle adjuster. This can be a good fine tune adjustment for idle, but it is basically just acting like a smaller version of Could definitely be the intake manifold but based on your description, it is most likely the rubber choke plunger pad not sealing. Hanging idle meaning slightly surging as I slow down and then slight high idle when I stop and then after 15-30 seconds slows down to a barely running idle which I would expect that it should drop down to immendiatley. The motor ran normally and would accelerate and decelerate normally. Above 1200 rpm will stay running but is rough. Then turn it clockwise till the idle speed starts to significantly decrease. Scottwr12345. Once i finished a cut the saw would take about 6-10 sec to come back down to 1999 - 2016 Super Duty - Hanging RPM's/slow return to idle - Hi all, I have a 04 F250 5. Converse OP. If you rev it 150 Hp 2 stroke Optimax will not run at low idle. Already took the throttle slack into consideration and it is fine. Having your engine set up professionally by a competent rolling road operator is vital to the safe running of your engine. I have been searching all over the internet. May 3, 2013 #2 Re: 1985 Mercury 50 HP idle too fast Sometimes cables get worn and the timing wont go back to the idle stop screw. A smaller engine will idle higher than a bigger So I'm wondering if I have a faulty adjuster or if I'm adjusting the wrong thing to slow the idle? Bosunsmate Admiral. I have tried adjusting the air screw but that doesn't help. Reply to this topic; Start new topic; Recommended Posts. 0 turns out. the intake consists of a 3/4 o. Just a thought or two. 5L. I've wrapped the secondaries spring with another wrap, I've replaced the throttle cable and added and extra return spring and still it's slow to return to normal. But ever since i have had the car it has had the "slow to return problem". Overall runs perfect with one exception. if i drop fast idle and put into gear quickly it will stay running but if i give it any more throttle than 1500 rpm it floods out and dies. Throw in a new set of D8EA's once the bike is warm, and let it idle for 4-5 minutes with a fan on the cases, then cut the engine. 5- adjust your idle cable slack so that it’s not loose as a goose 6- repeat step 4 If it’s still not functioning properly, adjust your cable slack accordingly. The single biggest issue is the engine does not return to idle in a reasonable time. This boat belonged to my grandfather and when he past away he If i start my bike up it idles ok for about 3-4mins at 1200 rpm. 0 for this IDK specifically about the Triumph carbs but in my experience CV carb that's slow to return to idle is caused by the idle being set too high. How a 2 Stroke Carburetor What limits the high speed fuel during idle? Is there some kind of valve actuated by the butterfly valve ? (called capillary screens) that limit the HS fuel flow at slow speeds. 0L with 83,000 miles, manual transmission. Housing cleaned out and lubed with TW25B grease. Your explanation of the problem and the engine indicates your engine is the two (2) carburetor model and that the compression and ignition are as they should be. com/carb/If your 2 stroke dirt bike has a hanging idle or it 2006 Yamaha 90 HP 2 stroke stalling at idle 08-11-2019, 05:28 PM Good afternoon let me start with some background on this engine. I also have a 1980 johnson 9. Is that with the idle knob adjusted all the way slow, or all the way fast? Hi, Have a 78 B with Zenith Stromberg carb, have great response when cold returning to idle but when at normal operating temp it takes up to 7 seconds for rpms to return to idle. I guess that there could still be a crack in the manifold on the A leaking left side crank seal could cause the engine to suck air and lean out, which of course can make a two stroke slow to return to idle. This engine has never idled that well, but previously, as soon as it starts if I apply some throttle it is good to go. They operate only by fuel draw requirements from the venturi . People fail to recognize that that 9. The I have an 8hp Mercury 2 stroke outboard for my dinghy and it has generally been very good, but recently after having just filled the gas with 97 Premium (at Valero) and adding the appropriate oil, it is now not running. In fact today, it actually stuck open at about 2000 RPM and no matter how many times I blipped the throttle it Old Victa 2 Stroke Idle Problem #28278 04/09/11 10:00 AM. I am pretty sure my jetting is good, I can wot the throttle at low revs and there is no bog no hesitation it pulls through nicely. I also see that "Idle RPM (in forward gear)" should be 600-700 RPMs. we also need to know what your fuel screws are set at. DougDotyTW200 Discussion starter. 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. Burned up several motors in the early-mid ‘80’s running agency provided Oil Co. My 2005 Mercury 90hp 4 stroke will run just fine but when you increase the throttle the RPM's will increase but the motor will not return to idle. I put new fuel pumps in last fall. T. Then with the vacuum lines still capped off and the engine running I sprayed everything with carb cleaner and never noticed any change in the engine idle rpm. If you are lugging these units they WILL idle poorly,foul plugs ,and at that point,become hard starting. Took my 2001 XR200R to my mechanic for a carburetor adjustment. I fogged it last fall and just fired it up this past weekend. It just stays at the max RPM's hit with the throttle. Members; 262 Location: If you screw the idle mixture screw about 2. According to the manual for a 97 and newer 25 hp, the idle should be set at 750 +/- 50 RPM in forward gear. In the second case, where the engine bogs on opening the throttle, it sounds like your idle jets are all plugged up because you didn't know about the tiny idle mixture ports and didn't run fuel system cleaner It does as you say, slow to return to idle. 0 turns out from fully closed, the screw no longer has any effect on the mixture, the RPM doesn't increase, the engine just runs too rich and there's a dull thudding sound in the exhaust pipe. Idle is set with the idle screw on the spark advance arm. 3 liter It does as you say, slow to return to idle. One easy way to do this is running the engine and revving it up while spraying the inside with the cleaner. Good for you . '05 KX85 w/103cc engine '97 DR407 '83 CR60 '05 TTR230 '06 KDX 200 '07 250XCW. From what you're describing there is a spring or screw or something that is not adjusted correctly or backwards. Carb initial adjustment, per manual is 1. Its annoying in between gears, or coming to a light. Stalling happens. 9 4-stroke rough idle when warm and more help! I purchased a mercury 9. Jan 1, 2024 #1 Just recently got this one. After it stalls I have to disconnect gas line, cover air intake and keep pulling until excess gas is sucked out and then it cranks again but at slow idle speeds it smokes a lot and will Re: 2003 Merc 9. DAMM 2 STROKE CLEVO'S !!! Save Share Reply Quote Like. The bike idles high for a short period of time and So after I got home, now im off the bike and reving it up I noticed the same thing I would rev up and the rpms would be veerryyy slow coming down vs a normal rev the rmps shoot up and drop back to idle fairly quickly. The issue im having is that when i Discover how to tune the air screw in just a few minutes [FREE Guide] - https://motocrosshideout. On an RT 100, the engine will drop back to idle after a good whack in about 3-4 seconds. 5 to 3. I can bog it down by putting in first at stoplight and letting clutch out slightly. The bike starts fine, idles well, but as the operating temps rise, so do the revs. The hesitation/bog from idle to 1/4 throttle and the slow return to idle suggest a lean low end (pilot jet), I recommend starting there. I took the "vacuum line"? off of the accelerator pump and my problem went away. 9a and 15a are designed to idle at 1100 rpm. Grips do not seat all the way to the housing, grip tube clean and not rubbing on bar end. A idle speed that is TOO SLOW or a LEAN idle mixture. This is why I,m thinking bad plugs or a lack of proper voltage to the plug through the switchbox the coil or the wire to the two malfunctioning cylinders. after lowering idle screw the sled idles at . It seems to start good, run good so I don't know if I should even worry about it. Oct 25, 2015 23 0 0 California. I also notice it when shifting gears. szei yket yws mmdvku ibk fxrn cwehu tdgig ebzwum cceskb