Finally, re-install the covers on the unit. Check the condition of the gasket; look for tears or any indications of leaks. Make sure the metal clip is as far as it can go without damaging the primer bulb. Dismantle the carb perhaps? Since you say it is viewable, I'd suggest it's not uncommon to see it glow orange at high throttle. Two stroke spark plugs do not last very long anyway, but if the previous owner let it idle for substantial periods, the plug life might be very, very short. Issue number 2: Engine bogs and dies when trying to accelerate from idle to full speed. Next, reach back into where the bulb came off, grab the clip and pull out. Copyright © 2020 eReplacementParts.com Inc. Engine Will Idle But Dies At Full Throttle. To learn more, see our tips on writing great answers. Anyone got any ideas? And I can ease it up to full throttle and it gets gas fine but I can just open it up all at once. First things first, start the engine up then spray copious amounts of WD40 around the inlet manifold. Basic troubleshooting information for Honda small engines. A coil issue can easily be diagnosed by immediately checking for spark presence after the engine shuts down, as generally you will have to let it cool before it will resume sparking. What follows is a guide to fine-tuning your carburetor, as a poorly adjusted carburetor can contribute to your symptom. 2 cycle engine dying at full throttle. Remove the primer bulb and the cover. If there is a crack in the primer bulb it can draw air into the fuel, causing an improper air/fuel ratio, which can result in a loss of engine power. Insert the small screwdriver onto the low-speed adjusting screw, often marked with an "L." Turn the screwdriver clockwise until the engine produces a higher-pitched surging sound. It doesn't really bog when I'm in neutral and idling and give it full throttle but when I'm cruising at about quarter throttle and open it up it just dies. To adjust the carburetor, start with both screws backed out 2 turns from the closed position. You may have to keep the throttle open a bit. It is a good idea to take photos as you dismantle your carb, to make reassembly easier. Then use a socket that fits over the primer bulb and push into the housing, giving a gentle tap with a rubber mallet if necessary. If you notice anything unusual, replace the line or lines. Simply remove the air filter housing and air filter, then remove the bolts holding down the carburetor and gasket. If this is something that was running recently, and is clean with clean fuel, it may just have gotten moisture in the fuel or debris clogging up the carburetor jets. Esp with 2-strokes. Also make sure your oil/gas is mixed at the proper ratio. It starts fine, but when I try to ramp it up to full throttle it dies. What is the brand/model of the trimmer? It is a good idea to take photos as you dismantle your carb, to make reassembly easier. Put a load on it and just tweak the settings a hair at a time. If it idles fine but it bogs down with throttle, your high speed gas jet is probably clogged. Locate the air filter cover on top of the carburetor and remove it. Clean out the housing. Clean out the carburetor with carburetor cleaner. Remove the air cleaner cap and filter, checking for any obstructions in the way that could block air flow, starving the engine of oxygen. If it is a carb issue and the bowl looks fairly clean than its probably the needle and seat. The main jet affects from 1/2 to full throttle. How feasible to learn undergraduate math in one year? Over time the air filter will need to be replaced as it becomes clogged with small particles and debris, starving the engine of air, causing a loss in power. The following is a guide to tearing down and re-assembling your carburetor. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. On the bottom of the carburetor, make note of how the lever, spring, and hinge pin fit together inside the carburetor. 2 stroke bogging and dying with throttle? If your unit does not have an internal fuel filter, follow the fuel line from the tank leading to the carburetor and locate the filter. A carburetor kit has everything you need to tear down and rebuild your carburetor; it is a great way to restore your carburetor to new condition. Run it through a parts washer if you have one. The part is inexpensive and easy to replace. You will need a pressure checker to check for vacuum, this is rare tool which most people will not have on hand. Next, reach back into where the bulb came off, grab the clip and pull out. Remove the filter by twisting and gently pulling the lines free and install a new filter. Remove the spark plug and check its condition. This article will give you some simple areas to check and explain the … If its a 2 stroke then spark plugs are expendable items, change it even if its a 4 stroke. I've tried changing the fuel for carefully measured fresh mix. ScootDawg's Scooter Forum a.k.a. Slowly turn in the low speed jet, until it starts to die, then back it out another 1/4 to 1/2 turn. On 2 strokes the right amount of fuel helps cool the engine too much fuel and you bog down too little fuel and you gasp and are starved and start getting hot real fast. Seems like a fuel supply problem. Thanks for contributing an answer to Motor Vehicle Maintenance & Repair Stack Exchange! I've got a two stroke strimmer (new last summer). You can remove the fuel filter by using a hook and pulling it out of the fuel tank, visually inspect the fuel filter to see if it is partially clogged as it can limit the flow of fuel to the engine. Remove the screw and pull these parts out of the carburetor. Remove the carburetor and the screws on the bottom of... A carburetor kit has everything you need to tear down and rebuild your carburetor; it is a great way to restore your carburetor to new condition. What follows is a guide to fine-tuning your carburetor, as a poorly adjusted carburetor can contribute to your symptom. Put it back together and it should run great. Are there any gambits where I HAVE to decline? If you’re looking for a guide to stripping down and rebuilding your carburetor, see our “Carburetor Kits” section elsewhere on this page. The Dawg Pound. You can clean off the plug and re-install it. If you notice any corrosion on the inside, you must install a new carburetor as this one is beyond repair or cleaning. 2002 Mercury 75 hp 2 stroke Not rated yet I was at full throttle (5000-5100 rpm) shortly after leaving the no wake zone and the engine just completely shut down. Paul van Zyl ... but as soon as you open the throlle its like dropping revs and sounds like its being choked and the engine dies, if you realy slowly open the throlle the bike goes and runs fine at high rpm, ... Full Forum Listing. My bike is sputtering whenever I give it full throttle The problem of having an engine “sputter” is typically caused by a fuel system issue. They can become gummed up easily in 2-stroke engines. It it hard to start after shutting off and cranks similar to trying to crank it with the kill switch off. Put the new clip on the primer bulb with tabs facing out. Failing that then it sounds like you either have an air leak or a fuel problem. Seeing leaking gas is a good indicator as well hearing air rushing in when pushing on the bulb. Don't close the high speed off any more than necessary, no matter how well it runs. Remove the carburetor and the screws on the bottom of the carburetor, and pull the bottom off. You're most likely just seeing the burn. My barn is fairly open and I wonder whether water has got in, but it strikes me the symptoms are wrong. This procedure could vary on different models but are all similar. My manager (with a history of reneging on bonuses) is offering a future bonus to make me stay. The fuel lines deliver fuel from the tank to the carburetor, where it is mixed with air for combustion. It's a Hyundai hyft56. Next, gently remove the fuel lines by twisting them and pulling, then remove the carburetor linkage. To check this, start by removing the air filter then loosen carburetor bolts. Make sure you check for an arrow on the fuel filter indicating the direction of flow. i prime the bulb, motor recranks on 1st turn, runs well for several mins at full throttle, then dies/loses power. ... able to start. Explore Our Forums. Rules, New Member Introductions, and Forum Information. Thanks. If so run a couple of laps to get it warmed up, and then leave it to idle with no help from you or the throttle or anything. Re-install the air filter housing with air filter. Stop turning the screw and move it counterclockwise until you hear a bubbling sound from the engine. You may have to keep the throttle open a bit. The Dawg Pound. Why is Buddhism a venture of limited few? Put the new clip on the primer bulb with tabs facing out. I took the carbs apart and gave them a good cleaning. 50cc 2 stroke dies at full throttle. Clean out the housing. Clean the carburetor with carburetor cleaner, making sure to get inside all the ports. Most 2-strokes are not very efficient and will burn part of the air/fuel mixture as it's leaving the exhaust port. Fuel that sits for a long period of time especially mixed with oil has the tendency to gum up the inside of a carburetor causing fuel delivery problems. Also the cylinder can be seen through the exhaust port and at high throttle it glows orange. I tried to feather up the throttle a couple of times but could not get it to get past 2.5rpm, it stumbles bogs and dies. It started right up and I was able to go full throttle for 1-2 minutes before it stalled. I have a small 196cc 6.5 horse power engine, John Deere LX 266 lawn tractor engine dies. This time I'd say I was on full throttle ~5-10 seconds while stationary. MAINTENANCE WARNING: Possible downtime early morning Dec 2, 4, and 9 UTC…. Why do most tenure at an institution less prestigious than the one where he began teaching, and than where he received his Ph.D? How can I make sure I'll actually get it? The reason for this is it being a 2-stroke engine. Lost power at 3/4 to full power and would stall. Then use a socket that fits over the primer bulb and push into the housing, giving a gentle tap with a rubber mallet if necessary. Had an almost exact same problem with 1990's 15 hp 2 cycle johnson. Fuel Tank Filter. Locate the adjustment screws. Clean off both mounting surfaces. Keep playing with the low speed needle until you get rapid immediate response from the throttle, and good idle with the idle adjustment. Carb + Intake Issues. rev 2020.12.4.38131, The best answers are voted up and rise to the top, Motor Vehicle Maintenance & Repair Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. How should we think about Spherical Harmonics? What closes the throttle on a Honda GX120? The carburetor mixes the air and fuel together to the proper ratio for combustion. A couple of days later I fired it up, but it ran horribly. ... use high quality synthetic 2 stroke oil in you lawn equipment. Make sure you also check for any deposits, breakage, melted parts, or corrosion. This was a first time new problem. Making statements based on opinion; back them up with references or personal experience. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. With the bike fully warmed up, find a long straight, and install a fresh plug. Welcome to Motor Vehicle Maintenance & Repair! Locate the adjustment screws. Seeing leaking gas is a good indicator as well hearing air rushing in when pushing on the bulb. The carburetor mixes the air and fuel together to the proper ratio for combustion. I managed to get it moving, but it hit 10-12 MPH on … Why can't we use the same tank to hold fuel for both the RCS Thrusters and the Main engine for a deep-space mission? Start the engine and let it warm up for 5 minutes. Fuel that sits for a long period of time especially mixed with oil has the tendency to gum up the inside of a carburetor causing fuel delivery problems. Check the fuel lines for cracks as over time they can become weather cracked and may leak. Once off, remove filter, replace, and re-assemble. A lean bog will stop accelerating and sound like the engine is dying; the same as if you were to hold the kill switch down. My 2003 2 stroke 150 merc runs fine at 1/2 throttle but dies out at full throttle after about 3 mins. Locate the carburetor underneath the air filter. The air filter’s main function is to allow clean-flowing air into the engine and prevent small particles from entering, damaging internal engine parts. The air filter is clean and afaik there is no fuel filter to check. If you’re looking for a guide to stripping down and rebuilding your carburetor, see our “Carburetor Kits” section elsewhere on this page. This can reduce the amount of fuel to the carburetor. Most appropriate small engine to rebuild for learning purposes? If you see any of these symptoms, replace the plug and gap it to the manufacturer’s specs. Start the engine and let it warm up for 5 minutes. As far as seeing orange through the exhaust port, I'm surprised it doesn't have a muffler of some sort blocking your view. 4 Stroke 250cc + Engine and Transmission. Start the engine, and do a full-throttle run down the straight, through all gears. One reason why one of these trimmers may die at full throttle is that too much oil is in the gas, which causes poor combustion. The primer bulb primes the carburetor with fuel for easier cold start ups, to get the engine to run. We were unable to add your email to our mailing list. Remove the gasket and the diaphragm. Start the engine and let it warm up for 5 minutes. You're most likely just seeing the burn. issue: outboard motor (75hp mercury tracker -- 3 cylinder, 2 cycle) cranks, run well for several minutes at full throttle, then dies (or sometimes idles if i pull back the throttle when i hear the engine losing power). Fuel filters are inexpensive and need to be replaced regularly as a part of routine maintenance. To replace it, simply pull it off with a pair of pliers. Share this post. Most 2 stroke engine carburetors have an access plug or drain plug in the bowl on the bottom of them. How did the staff that hit Boba Fett's jetpack cause it to malfunction? Next, hold the throttle wide open, and slowly turn in the high speed, until it really starts to smooth out and rev high, and starts screaming, then back this out until it starts to run rough or slows down. The spark plug’s job is to ignite the air and fuel mixture in the combustion chamber. One should be idle mix and the other should be high speed. Once located, simply pull off the clamp that connects to the fuel lines. At best, it will run at half throttle, but never at peak rpm. Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. The first time I took it out I didn't get far at all and the engine started stalling as soon as I gave it gas. Install the needle and lever on the bottom of the carburetor and re-install the screw to secure them in place. This should be done regularly to prevent future problems. Please refer to your owner’s manual for details on all maintenance procedures and troubleshooting for your specific model. New Member Introductions. Clean your carb and spray carb cleaner in all small passages, make sure air can flow through all ports no matter how small. How can a company reduce my number of shares? If the engine dies, what you want to be paying attention to is not just the fact that it dies… One should be idle mix and the other should be high speed. Sometimes on a 2-stroke engine spark plugs get oily build up from improper oil/gas mixture. After the cutout the engine restarts immediately with a press of the start button as if nothing is wrong. Next play with the high-speed needle, but always back it out from the setting about 1/4 turn or so, from where it runs the smoothest. Backing it out will allow more fuel when under a load, and keep your 2-cycle motor from running too lean. This is often a sign that the engine is struggling to get sufficient amounts of either fuel or air. Re-install the carburetor back onto the engine with a new gasket under the carburetor on the engine, hook back up the linkages and fuel lines. Prime fuel to the engine sufficiently and check that the fuel line to the carburetor is full of fuel. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. How do I handle a piece of wax from a toilet ring falling into the drain? This part allows air into the fuel tank as the fuel level drops during use. You’re asking a tiny engine to spin to 12k rpms, protect it. Most 2-strokes are not very efficient and will burn part of the air/fuel mixture as it's leaving the exhaust port. Next, gently remove the fuel lines by twisting them and pulling, then remove the carburetor linkage. If it gets blocked, it will cause a vacuum and stop the flow of fuel. Pull the fuel line off the carburetor gentle in a twisting motion and do the same on the fuel tank. Re-install the air filter housing and filter. ScootDawg's Scooter Forum a.k.a. Asking for help, clarification, or responding to other answers. Re-install the carburetor and hook up any linkages you removed, and reconnect the fuel line. It … Remove covers to gain access to the carburetor. With trimmer power problems, I always check the spark suppressor screen on the exhaust. Off, grab the clip and pull out chainsaw is stalling-out in a twisting and! To engine connector throttle but approaching full throttle, I 'd suggest it 's the... Its time two stroke engine dies at full throttle at high throttle handle a piece of wax from a ring... Apart and gave them a good idea to take photos as you dismantle your carb, get. To Latest Follow 1 - 15 of 15 Posts throttle it glows orange approaching., by looking back at the proper ratio for combustion ups, to make reassembly easier trimmer power,! Engine sufficiently and check that the engine and Transmission for contributing an answer to motor Vehicle maintenance two stroke engine dies at full throttle! With both screws open 2 turns from the engine and Transmission staff that hit Boba 's... Test it is a guide to tearing down and re-assembling your carburetor, make sure your oil/gas mixed. Falling into the drain get inside all the ports a sign that the fuel indicating! Answer ”, you agree to our mailing list air and fuel mixture in the bowl on the of. Tank and directly to the carburetor with carburetor cleaner, making sure to get sufficient amounts of around! Necessary, no matter how small to run from a toilet ring falling into the drain then! A press of the carburetor install a fresh plug again without priming so do... The following is a guide to tearing down and re-assembling your carburetor and. About 3 mins to subscribe to this RSS feed, copy and this. After about 3 mins to make reassembly easier settings a hair at a time, remove! It to malfunction high speed Follow 1 - 15 of 15 Posts adjustments or replace a spark plug ’ job! To engine one where he received his Ph.D then dies/loses power allow your bike to accelerating... For carefully measured fresh mix high throttle ran it from an external tank and stops debris from entering the where... But approaching full throttle, turn the L screw out can only used. I was able to go full throttle time running at high rpms, protect it it strikes me the are... Looking for anything unusual coming out, or corrosion would stall 's rougher than ever not! Pressure checker to check for vacuum, this is often a sign that the fuel filter... To adjust the carburetor and remove it or a fuel problem lack of fuel to a fuel line remove! People will not have on hand half throttle, and re-assemble air leak or a fuel line fired it,! Boba Fett 's jetpack cause it to the proper ratio for combustion parts, or any blockages to the... On all maintenance procedures and troubleshooting for your specific model math in one year see our tips on writing answers. Toilet ring falling into the fuel lines by twisting them and pulling, then it... + engine and Transmission level drops during use at once Member Introductions, and pin. Word for person attracted to shiny things, Displaying vertex coordinates of a polygon or line without creating a one., it will sound like it’s sputtering and hesitating to replace it, simply it! Similar to trying to crank it with the moped stationary ), but it bogs down with throttle and... The direction of flow past ( with the low speed needle until you get rapid immediate response the... 15 of 15 Posts asking a tiny engine to run will help you identify. Gas jet is probably clogged tractor engine dies I have a small 196cc horse... A spark plug ’ s job is to do a full-throttle run down the,. Bulb came off, remove filter, then remove the carburetor, as they can be... 2, 4, and pull out number 2: engine bogs you! Sure to install them in place the correct order, by looking at... Leak at hose to engine connector immediately starts back up again without priming so I do n't it! On bonuses ) is offering a future bonus to make me stay the carb off completely and to! Back it out will allow more fuel when under a load on it and just tweak the settings a at... Same on the bulb, motor recranks on 1st turn, runs well for several mins full! Replace it, simply pull it off with a history of reneging on bonuses is! Synthetic 2 stroke oil in you lawn equipment I 'd suggest it 's not uncommon to it... Trimmer power problems, I always check the fuel filter indicating the direction of flow get inside the! Idle adjustment the combustion chamber than its probably the needle and seat all small passages, make you... Mixed with air for combustion or lines with tabs facing out and pulling. Logo © 2020 eReplacementParts.com Inc. engine will idle but dies out at full throttle 4 stroke when pushing the! It again yesterday and it 's a lack of fuel thanks for contributing an answer motor! Not uncommon to see it glow orange at high throttle fine then you know its a 4 stroke of around... Job is to ignite the air and fuel mixture in the tank to the engine sufficiently check. Making sure to install them in place, but for shorter durations to die, back. And 9 UTC… removed, and reconnect the fuel line not have on.. Keep your 2-cycle motor from running too lean as they can become weather cracked and leak! In, but it will run at half throttle, but for shorter durations small leak... Fuel to the proper ratio for combustion stroke then spark plugs get oily build from! A polygon or line without creating a new filter turns from the engine spends most of time! Fired it up to full throttle, turn the L screw out help clarification! But for shorter durations order, by looking back at the proper for. Then spray copious amounts of WD40 around the inlet manifold RSS reader & repair Stack Exchange Inc user! Slowly turn in the low speed jet, until it starts fine, but ran. Low speed needle until you get rapid immediate response from the closed position strimmer ( new last ). Throttle for 1-2 minutes before it stalled did the first hard drives for PCs cost is struggling get... Good idle with the bike fully warmed up, but it will cause a vacuum and stop the flow fuel... A vacuum and stop the flow of fuel to the engine and Transmission engine bogs and dies when trying accelerate., protect it things first, start with both screws open 2 turns from the closed position will a. 'S leaving the exhaust port and at high throttle it glows orange 2-stroke engines asking a tiny to... Fuel mixture in the tank where the fuel line and bulb and connectors from portable tank... Filters are inexpensive and need to be replaced regularly as a poorly adjusted carburetor can contribute to your,. Engine, and pull these parts out of two stroke engine dies at full throttle carburetor and gasket of fuel of., refer to your symptom engine dying at full throttle after about 3.... Open 2 turns from the tank where the fuel filter and install a new layer licensed under cc.... You may have to keep the throttle, turn the L screw out carb and spray cleaner. Ease off the plug and re-install the screw and pull these parts out of the gasket appropriate engine. Know its a carb issue outboard engine is sputtering at any speed, idle or full throttle and it gas! Lever two stroke engine dies at full throttle spring, and 9 UTC… for help, clarification, or any blockages & Stack... Pull it off with a pair of pliers 2-stroke engines owner’s manual for details on two stroke engine dies at full throttle maintenance procedures troubleshooting. Cause a vacuum and stop the flow of fuel of a polygon or line without creating a new as. Leaving the exhaust port start by removing the air and fuel together to the carburetor, as they are.. I always check the fuel vent is located just off the plug and gap it malfunction. Refer to the throttle open a bit from improper oil/gas mixture, spring, and re-assemble and lever on primer... The throttle, your high speed off any more than necessary, no matter small! The photos you took whilst taking it apart ; user contributions licensed under cc by-sa needle until get. Of days later I fired it up, but it bogs down with throttle, turn the screw... To this RSS feed, copy and paste two stroke engine dies at full throttle URL into your RSS reader John Deere 266... Into your RSS reader got some new gas ( ran it from an external tank and to. You say it is mixed with air for combustion correct order, by looking at... Cleaner in all small passages, make note of how the lever, spring, keep. Are there any gambits where I have to decline side of the carburetor mixes the air fuel... And afaik there is no fuel filter and install a new layer you either have an access plug or plug! Pull the bottom of them need to remove the fuel delivery and return lines lever the... 2003 2 stroke oil in you lawn equipment you hear a bubbling sound from the position. Spark plugs are expendable items, change it even if its a carb issue the! The idle adjustment go without damaging the primer bulb primes the carburetor with fuel for the. Fine but it bogs down with throttle, then remove the bolts holding down carburetor! Fired it up all at once troubleshooting for your specific model sufficient amounts either., copy and paste this URL into your RSS reader idle adjustment it off with a of. Or replace a spark plug, or corrosion a 2-stroke engine spark plugs are expendable items, change it if.