4 Stroke Engine Only Runs With Choke On

You Inc-ry choke it too much. Even when it is running it acts like it has a miss. Someone said to replace the diaframe. Just make sure to use the right kind of oil. Cannot find an adjustment for the fuel mixture. My mercury 4hp 2stroke starts only on full choke runs for a second and cuts out. Two Stroke Guides. When your trimmer starts and runs on choke, it could be because the check valve in the gas cap is clogged. Fresh unleaded fuel must be used in this unit. That is with throttle full open. increase the L screw and slightly decrease the H screw. This is the classic dead giveaway sign of a fuel delivery problem. I changed my oil due to the gasoline in there, now my bike will only startup with the choke, then it dies when given throttle. After the break-in period and many hours running the BF2D outboard the Honda engine continued to start everytime without any hiccups. Finally the engine will start and run, But it only runs with the choke almost closed (about 1/4 open) and the foot pedal at 1 to 2 inches depressed. Walbro carbs on Four Stroke engines I decided to start a thread for people who are thinking of running a four stroke RC engine or already are. Some times a back fire into the carburetor will blow a pressed-in BB out of a drilled passage way. Then I adjusted bowl needle valve out 1/2 turn at a time until it ran on no choke and ran smoothly. I just got around to flushing out the tank and carb bowl, added some fresh gas and additive. your engine probably would not run under any conditions. Each had unique engineering specs, power capabilities and intended uses. Finally the engine will start and run, But it only runs with the choke almost closed (about 1/4 open) and the foot pedal at 1 to 2 inches depressed. All the components of these type of carburetors like float bowl, fuel bowl, needle, float, nozzle and venturi , seat and nozzle emulsion tube can easily be serviced without any need to remove the entire carburetor body out from the engine. More than that, there is too much choke and the engine will die. (From: [email protected] what do you mean exactly by gearing? for the engine or the bike itself? i bought the 4 stroke engine kit off of ebay. Re: 4 HP Yamaha only runs with choke pulled It being only 3 years old, and as long as you're careful and take your time, you'll be ok reusing what's in there. turn off choke and try revving the engine. it will idle ok kinda high. It works 175MPH. The Zenoah G231PUM (22. I will say if your small engine wont start or wont stay running you need to either rebuild or replace your carburetor. The first time it happened to me I was in a panic trying to stop the engine before it blew. Running extra rich (within reason, half choke) on a 4 stroke doesn't foul a plug. the choke is operated by the EMU(engine management unit)therefore if your bike doesn,t have auto choke it must be an old model so save money and keep with manual. With no choke it runs, but stumbles slightly. Now I don't have to run it with the choke slightly on. I think you may find that you have a fouled spark plug or a very choked up exhaust muffler system Although you didn't mention if the Craftsman blower is a 2 stroke or 4 stroke type (I assume it is 4 stroke because of the forum it is in) however running that rich a mixture for that long would definitely carbon up the spark plug (and fill the muffler baffles with oily residue, if a 2 stroke). Revs out high and then stalls. Re: 4 HP Yamaha only runs with choke pulled It being only 3 years old, and as long as you're careful and take your time, you'll be ok reusing what's in there. One caution here - don't run your engine for very long on starting fluid because it's hard on the engine. You did not mention where this two stroke engine is used but if it is like most what we are talking about is weed whackers, chain saws, and some other smallish lawn and garden type tools. In all cases you should check the oil level prior to starting. congats, it should run. What should a Rotax 912ul do when you pull the choke with the engine running? Mine speeds up about 200RPM, except at wide open throttle. John Deere Gator JD Gator only runs with choke: 2009-10-31 15:17:55 166633 badnova I just picked up a used 4x2 from a friend and it only runs with choke 1/2 way (it will run without but once you give gas it dies). How do I adjust the carb to make it run properly Jim September 2009. Mostly due to crusty carburetors or misadjusted speed screw settings. 10 HP Briggs and Stratton, only runs on CHOKE. 9 only runs with choke on when you pull the choke on, what you are in fact doing is decreasing the amount of air, and therefore increasing the amount of fuel so, as mentioned, you have a dirty/blocked carby, or quite a bad air leak in the manifld/gasket more than likely carby rebuild though, pretty simple thing if you are fairly handy and take your time. Working closely together with various 4-stroke scooter manufacturers, we have managed to increase engine performance and running smoothness. 5 hours on one tank of fuel at 50% load capacity (3. Remove the old coil (Photo 4). Finally got it started with starter fluid and it'd only idle with the choke on, choke off it'll run, but pops, doesn't run well and won't idle. Its a blower/vac combo. While the engine is running, stand behind the engine to make any adjustments to the needle valves. Engine should start and run with these basic settings. Is there something else I should check for?. The first thing to do is not set up the idle speed, but to set the Idle mixture screw to lean best idle setting. If you have to add choke, it is getting to much air for the fuel. More than that, there is too much choke and the engine will die. i am trying to put a honda 8 hp motor on a gocart, it is off of a trash pump, it runs great, but only runs good with the choke on all the way, take the choke of 1/4 and the motor will run about 6500 r … read more. but same, i feel the engine so rich while running low. I thought this engine sounded cool with the lumpiness, but it is a 4 stroke engine. IMPORTANT: If the boat is to be water tested, the operator should be familiar with the operation procedures in the Operation and Maintenance Manual. I also do know that people say you shouldnt leave your fuel on on a 2 stroke. I changed my oil due to the gasoline in there, now my bike will only startup with the choke, then it dies when given throttle. Clogged low speed and idle circuit. If you've determined that you have a weak spark or no spark, go ahead and buy and install a new coil. What you need to know about Polaris 650 750 780 785's First I'd like to welcome you to Greenhulk. lawnmower only run on full choke? Suffolk Punch 35s lawnmower will only run with the choke setting on full Dont know whether it is a 2 stroke or 4 stroke engine. Only runs when choke is on. Mine is going on a 1/4 scale cub. Off and on it will stall or just about stall. As soon as I full the trigger, it cuts off. (201 bought. With one click it is a bit smoother, and with two clicks it runs the smoothest. If you take the choke off then it dies right away. As soon as I give it revs the choke automatically disengages & the engine stops straight away. It ran well at all throttle positions. The key is to be thorough, somewhat anal, about cleaning each passage and port. 4-STROKE STARTING TIPS: With the four-stroke revolution bumping the rev limiter, more and more two-stroke fiends are entering the world of cams and valves and pumper carbs. Mercury FourStroke ProKicker outboard motors deliver superior torque for greater acceleration control. As this valve opens, air flows into the carburetor and mixes with gasoline. Carbon chokes off airflow, which causes the engine to slowly lose power and run poorly. Search within model. 8 hp has a new option. Is this an air leak? This is the Champion 4500 watt with the Honda knock-off engine. I replace the reed valve gasket as well. I have a sdg 125cc 4 stroke Chinese pit bike recently I had to chage the oil pump gear in it the cam chain came off and broke a tooth on it after replacing that and a bent exhaust valve the bike only runs with the choke on now before this did not happen I thought maybe the jets would be junked up. A choke on a lawnmower engine, or any engine with a carburetor, is a device that reduces the airflow through the carburetor. When the passages start to plug up the engine does not get the needed fuel to run smoothly. Johnson 4hp 2 Stroke Outboard Engine. The generator will start and appears to run at speed with the choke on but it dies when I move it to run. There are many different types of carbs, but they all operate the same. "Air" is usually never the problem. 5hp Mercury in the past and currently owning a Yamaha 2. Anyone with experience on Stihl 4-Mix feel free to chime in. The way you add oil differs whether you have a 4-stroke or 2-stroke engine. Engine Starts with starter fluid, but won't stay running for it and you have determined the engine runs, but this is a Honda and they make one of the best engines. I think you may find that you have a fouled spark plug or a very choked up exhaust muffler system Although you didn't mention if the Craftsman blower is a 2 stroke or 4 stroke type (I assume it is 4 stroke because of the forum it is in) however running that rich a mixture for that long would definitely carbon up the spark plug (and fill the muffler baffles with oily residue, if a 2 stroke). We pack a lot of punch for the buck in this truly unique outboard! In the 10 hp/9. (201 bought. last night i was try using 17. The unit only starts with choke closed and throttle wide open. One caution here - don't run your engine for very long on starting fluid because it's hard on the engine. Bunnings price is $699, others $720 – $710. Starts first time, runs perfectly appart from even after a long running time, if I start to move the choke from full on to anywhere toward the off the engine cuts out. One question I’ve been asked many times by two stroke customers-bikes, sleds, or Atv’s. The bike was running fine, but I wanted to make sure it stayed that way so I pulled apart the carb to clean and look things over because previous owner had not done so in awhile. More than that, there is too much choke and the engine will die. Is this an air leak? This is the Champion 4500 watt with the Honda knock-off engine. The issue only seems to happen when boat is first starting up. (201 bought. It’s effectively running too lean as there isn’t enough fuel for the available air hence why it runs fine with the choke on. TO PRIME THE MOTOR. It's an introduction to small engines and covers many of the things that apply to 2-stroke engines (which will be covered on this page). But when it does start it runs fine. 9 four stroke engine runs smooth with a rpm loss, IT"S the cdi gone BAD. If you take the choke off then it dies right away. congats, it should run. So far I have checked the following. While you may have a different style carburetor on your machine, the remedies de-scribed here-in will work with most any type of carburetor. 4 stroke is good. If it doesn't sort the problem then at least it wont do any harm! Failing that then it sounds like you either have an air leak or a fuel problem. Most 912ULS engines are rougher with the choke on than off. But if an engine idles well, but runs only at higher RPM (up to 3,200 RPM with a fixed/non-adjustable main jet; or 3,600 RPM with an adjustable main jet) with the choke partially closed, or if it surges or hesitates to rev up upon acceleration, this means the engine is running too lean on fuel, and following are the most likely causes: (listed. Solved: Craftsman leaf blower only runs at full throttle and half choke Discussion in ' Do It Yourself (Not Computer-Related) ' started by lexmarks567 , Aug 12, 2006. As long as the engine stays running idle speed is not important at this point. Choke just means you have reduced the airflow. Please leave a comment if you have any questions. Off and on it will stall or just about stall. If I take off the choke it starts to run stronger, but then bogs and dies. Two-stroke motors are likely to need choke for a maximum of only a couple of seconds after the engine fires - as soon as you've let go of the starter cord, put your hand on the choke and be ready to flick it to the running position immediately after the engine revs start to dip. I wasn’t just thinking of explosion in cylinders pushing pistons up and down. As this valve opens, air flows into the carburetor and mixes with gasoline. The engine runs better with the choke partly on BECAUSE it's getting too much air with the choke all the way off. My 2007 Mercury (by Tohatsu) 9. A rich mixture will cause poor performance, but a lean mixture can destroy your engine (over time). line to stop the engine, but only if it is accessible. Spray carb cleaner into all of the orifices and needles. It starts fine and runs fine until warm then runs very rough. Hopefully this thread will help someone down the road and save a few engines. Gumout ® Carb/Choke & Parts Cleaner quickly removes these deposits from the inside and outside of the carburetor to improve engine performance and fuel economy. Turn the choke off and assess. Took it out last weekend after toping off the gas tank. If the engine is cold, 8 hours or more, it will start up with no choke but will die after 3 or 4 mins. your choke system by passes the jets that is why it runs on the choke setting only. If you think about the operation of the carb the pilot jet feeds fuel from idle up to 1/4 throttle then the main jet needle takes over fron 1/4-3/4 throttle and the main jet handles 3/4-full throttle. Bogs and dies when choke is off. Hopefully this thread will help someone down the road and save a few engines. “Makita has changed the game and delivered the solution with the development of the world’s first 4-stroke engine power cutter. Ask Question Asked 3 months ago. Do NOT mix oil with fuel. The engine air filter cleans the air sucked in by the engine. The motor has been converted from oil inj. If it only runs on full choke it may have a whacked out float height or a clogged jet keeping it from getting the gas, too. First things first, start the engine up then spray copious amounts of WD40 around the inlet manifold. Engine has only about 15 hrs running time. Starts, runs for a while. 5 HP 196cc 4-Stroke OHV Industrial Grade Gas Engine with Recoil Start and Universal Mounting Pattern : Power Tools Four Stroke Engines : Garden & Outdoor. Don’t just rely on the engine temperature gauge or feeling the fins of the engine. I looked at buying a trimmer today. I put it on the water and ran it about once a week on a 16 boat, trolling with it for about 3-4 hours every time on idle. Do not throw anything into the spinning propeller or attempt to use your hands to stop the engine. Then when I get ready to ride. Another option to protect small engines is to completely drain the engines of all fuel. Four Stroke Engine. It runs with the choke on, but doesn't have full power. Questions & Answers Page A. Just did two engines that had the same problem. Do NOT use Etha-nol based fuels. my Huasheng 4 stroke engine dies when i turn off the choke fully. The motor was running great, but this weekend the motor wouldn't run right, i think i had the wrong mixture. So, we?ve enlisted the top revolutionaries in the sport to teach the masses how they. If you think about the operation of the carb the pilot jet feeds fuel from idle up to 1/4 throttle then the main jet needle takes over fron 1/4-3/4 throttle and the main jet handles 3/4-full throttle. The only way to fix this, is with a total engine rebuild. Two to five hundred miles is frequently required to completely break-in a four stroke. Engine will only run on only full choke - Answered by a verified Technician We use cookies to give you the best possible experience on our website. I almost always need to have the choke out to some degree for the motor to run right. The main drawback to a loopcharged engine is the cylinder size. only runs decent when choke is on. However select models may be shipped with a full crankcase. Have a Yamaha 9. I have taken the muffler off & it was well choked up with coke but after cleaning it's still doing it. So I cant get by the thought that there must be an air leak that gives a burnable mixture with the choke closed but causes the mixture to go too lean once the choke or throttle is. If the engine changes note or rpm you have found a leak. Set the pull-off so the choke is a little tighter. Two Stroke Engines How a two stroke engine works. Ask Question Asked 3 months ago. The carb may have put out too much fuel and flooded the engine ( too much fuel for the engine to start, wet spark plug, etc. It had been put up for a while ( a few months), it wouldn't start when i went to get it out. it runs smoothly and sounds fine as. Although it may have something to do with your E3 Car Spark Plug , it is more likely the result of using E10 gasoline, especially if you live in a hot, humid area of the country. Then they'll have "hybrid" systems with the four-stroke motor hooked up to a generator on the backpack, along with a lithium battery, and an electric motor powering the weedwhacker. FR651V-AS00 4 Stroke Engine FR651V; Ask us about the Kawasaki 160410007 Carburetor Choke Shaft. Will stall out if I rev it too quickly. For the engine to run smoothly and efficiently it needs to be provided with the right quantity of fuel /air mixture according to its wide range of demands. Snow blowers use 4 stroke engines just like mower on its side If there's only a small amount on the choke if the engine has been running in the last 5 minutes. I think the only thing better for the 4-stroke would be if Merc hurries up and adds EFI to the 90 HP. Two possibilities, 1 Air leak-carb, head gasket, crankshaft seal. i have a 4 stroke 125cc bike it only runs with the choke on however it doesn't idle, when the choke is off it idles but the throttle stutters like gaps in the revs and barely moves. This series of carburetors comes with each 2 and 4-cycle engines. Search within model. I will say if your small engine wont start or wont stay running you need to either rebuild or replace your carburetor. Re: Craftsman 2 stroke 25cc string trimmer only runs on 80% choke VEry Very Very important on these engines is to adjust them properly. I have taken the muffler off & it was well choked up with coke but after cleaning it's still doing it. Please leave a comment if you have any questions. The 2 stroke design has only a handful of moving parts. I then started it, and on full choke it would idle fine (idle fast that is but that's normal on full choke). I posted a while back that my generator wouldn't start. If I take off the choke it starts to run stronger, but then bogs and dies. Best Answer: Carby and/or fuel supply issues. Then when you choke the engine, it delivers more fuel and the engine will smooth out. This is for bowl type carburetors only. The choke is literally an extra air hole opening up. ? 4 stroke engine on a log splitter. For info specific to your carb, we recommend that you purchase the proper repair. 9 4 stroke kicker became difficult to start and impossible to keep running at low to medium idle speed. One carb may fit several applications. 2) Choke pull-off opening too much. Took carb apart and cleaned but same problem. Do not see any fuel adjustment on Carb. Clogged low speed and idle circuit. I have a Mercury 2 stroke on a boston whaler. 5hp 4 stroke I was already aware of some of the benefits including quieter running and better fuel efficiency. With regard to your problem, running with the choke on indicates a very lean mixture. Honda Marine - 4-stroke outboard motors from 2 to 250 hp. Fits up to 5/8 inch panel thickness. The technically correct term is actually four stroke cycle. It does run much better but still won't idle. 5cc) marine engine features an improved cylinder design with 4 transfer ports, high rpm piston with a thin 1. It's an echo trimmer with a Zama carb. This file is a tidied up version of my random notes and questions. I am still on my first tank of gas with the rich oil mix but I don't think that would cause this problem. The bulb gets cracks and sucks air. Recoil start models produce 6 amps at 3000 RPM. A lawn mower engine is quite simple and basic compared to the one fitted to your car, although the principle of operation is the same. Off and on it will stall or just about stall. Basic Carb Adjusting Procedures/Guidelines - Timing can affect performance. Once the sled is warm, no stumble. com is the leading importer and authorized distributor of authentic JL Zeda 2 stroke motorized bicycle engine kits in the United States. If the engine will only run with a battery it is DC. Flooded engines can be started by placing the choke lever in the My tractor starts and runs great until I this is not only very dangerous but will damage your. Fuel/air mixture. Cannot find an adjustment for the fuel mixture. putting a tablespoon of gas in the throat of carburetor, engine starts immediately and runs 2-3 seconds until tablespoon of gas is consumed. So today I tried some of the Seafoam stuff. Take a sample of the line to a small engine place, as they're an odd diameter, usually. Victa 4 Stroke Honda Engine Lawn Mower MCA485 (retail $739) It's a Victa Mustang with a Honda engine with alloy chassis. It will only run with the choke out at least 1/2 way and at least 3/4 to full throttle. Sierra Ignition Switches are covered by Sierra’s Industry Leading Warranty. If I turn the choke to full open/run position it will die instantly. I replaced all of the gaskets in the top end. SOURCE: engine only runs with choke on dear honda 750 your problem is a pluged main jet you must completley disasseble the carbs and give them a good cleaning with carb cleaner and comp air visually check to make sure you can see light through the jets after cleaning. General rule of thumb is to only use the choke/enrichener for. Why does your Briggs and stratton quantum xm 4 hp engine start but not keep running? Mine was cracked and the only way it would run was with the choke on about half way. It might be worth jacking up the back axle and with the engine running spray some WD40 around the unions. Three-wheeler vehicles, auto rickshaws, which provide much of the Delhi’s public transport, still run on heavily polluting two-stroke engines. Honda 135 hp 4 Stroke Outboard Engine + All Cabling and Controls | eBay. Upright, sideways, even upside down - the Mini 4-Strokes will still run great. 5hp Mercury in the past and currently owning a Yamaha 2. You will not know if the BB is missing cause it will look like another hole in the carburetor. “Makita has changed the game and delivered the solution with the development of the world’s first 4-stroke engine power cutter. A Lawn Boy Mower is best for hilly slopes because they don't have any oil in the bottom like a 4 stroke - the 4 strokes run out of oil if you run them on a hill, but the Lawn-Boys are 2 stroke. The motor fan for the. Honda 40 4 stroke choke control issues Hi I am new to the forum, THE STORY I have a honda 40hp 4 stroke last year I took it out of storage it had been in storage for 4 years replaced the lower unit seals then had carb problems took it to the boat shop they had it for 2 months and were unable to fix it they re replaced the lower unit seals they said I did not put them in right, not sure if i. Lots of black gorp in the water, and I thought it was starting to improve halfway through the tank. Just make sure the engine is running smoothly at idle and not conking out. With the engine running, use a can of carburetor cleaner to spray down the hoses and vacuum connections. Immediately upon pushing the choke back in, the outboard fails. Only a small amount of gasoline, about 10mg per combustion stroke, is needed to make a typical 4-stroke combustion engine run. Once the engine is running steadily allow 30 seconds before closing the choke knob (if starting in extremely high temperatures release the ‘Hot-Start lever’ after several second allowing the machine to settle to idle), allow the engine to warm gently, there is no need to increase rpm’s or ‘blip’ the throttle on a 4-Stroke engine as. This is the classic dead giveaway sign of a fuel delivery problem. Because your gasoline is old and some of its valuable volatile ingredients of evaporated out, or the gasoline has a lot of water in it, or the spark plug gap is. Bunnings price is $699, others $720 – $710. For a closely toleranced street four stroke it often takes 1000 to 1500 miles or even more! I dump the oil and filter in a four stroke after the first 75 miles, again at 200 miles, 500 miles, 1000 miles and each 1500 miles thereafter on a street engine. The 2 stroke design has only a handful of moving parts. congats, it should run. The moment I release the choke, even just release it by a quarter, the engine dies. 9 only runs with choke on when you pull the choke on, what you are in fact doing is decreasing the amount of air, and therefore increasing the amount of fuel so, as mentioned, you have a dirty/blocked carby, or quite a bad air leak in the manifld/gasket more than likely carby rebuild though, pretty simple thing if you are fairly handy and take your time. It's an introduction to small engines and covers many of the things that apply to 2-stroke engines (which will be covered on this page). Fuel blockage somewhere???? I am at wits end, I’ve never had a problem like this in all my years of small engines. Upright, sideways, even upside down - the Mini 4-Strokes will still run great. Tiller is only five years old and is used maybe at most 4 times a year. Break the carb down into parts. The other could be a clogged low speed and idle circuit. com, a choke is designed to help engines start more quickly and efficiently when they are cold. With regard to your problem, running with the choke on indicates a very lean mixture. If the top end is only affected with the choke on, you're too lean on the main jet. Take a sample of the line to a small engine place, as they're an odd diameter, usually. Is there a carborator I can clean or an air intake that's … read more. Re: 4 HP Yamaha only runs with choke pulled It being only 3 years old, and as long as you're careful and take your time, you'll be ok reusing what's in there. Engine Starts with starter fluid, but won't stay running for it and you have determined the engine runs, but this is a Honda and they make one of the best engines. Do NOT mix oil with fuel. One carb may fit several applications. Engines start and run good and the last owner said they have no issues. The throttle plate or throttle valve controls the amount of air that is allowed to flow through the carburetor (the tube). The crossflow engine is 4. 9hp 4 stroke. Handy to have a camera by your side and a notepad for keeping track of what goes where. However as soon as I go to turn off the choke, it dies. 2 stroke carb adjustment Boat and Motor Tech. Mini 4-Stroke Series. 2 days ago, I ran the motor at home in a tank of water. It is very important to have the fuel screw on 4 stroke MX bikes set properly. It might be worth jacking up the back axle and with the engine running spray some WD40 around the unions. Mariner - 4 Stroke Outboard Manual Start, Tiller Control ? Short/Long Shaft Option Engine boat United Kingdom. My Mercury 9. 9 hp category, Tohatsu has once again proven itself the leader of the pack with this 9. Warmed on full choke until it stalled. I cant understand why the engine runs on full choke, they usually only give a kick and you go to half choke for cold start and then fully open once engine warmed up. Immediately upon turning off the choke it dies. Then lift off the gas tank and remove any engine shields to access the ignition coil. Break the carb down into parts. While the engine is running, stand behind the engine to make any adjustments to the needle valves. For 2-stroke engines, use a quality oil expressly labeled: 50:1 Two Stroke Mixing Oil for Air Cooled Engines – and only mix it 50 parts gas to 1 part oil. Time for an afternoon on Google to see what’s available. 1) Set choke a little tighter and retry. not my fault all of you are butt hurt. Do NOT mix oil with fuel. The crossflow engine is 4. I noticed on your model that the engine has a fuel pump and the fuel tank is in the rear of the tractor. Jim, I agree with Barelahh. 5HP OHV 4 Stroke 160cc engine new never used, it is a choke start system and runs with normal unleaded petrol only, this engine suits most Masport, Rover, MTD, Honda, Sanli and other mowers requiring a 70mm shaft size (Engine PTO shaft size: 70mm x 22. A fuel injection system Petrol-engined cars use indirect fuel injection. How do I adjust the carb to make it run properly Jim September 2009. It's running massively lean, and only when you put the choke on does it just about give the engine enough fuel to run properly (at idle) It's a bad idea, very quickly you'll run the risk of the engine cold seizing (where the piston overheats, expands and welds itself to the inside of the cylinder. The engine has had a recent rebore and new crankshaft seals. Once the sled is warm, no stumble. This is a standard replacement belt for the GY6 50cc 139QMB 4-stroke short-case engine. Saito recommends use of 4-stroke plugs that are designed to operate in 4-stroke engines. my 83 atc 185 will run well with the choke on, and will idle great with the choke off, but will not run at all above idle with the choke off. The engine you are looking at is a two cylindar engine which power wise should perform a bit better than the one cylinder that I have. You turn the key, and the motor cranks and cranks but just won't run. Two Stroke Guides. Carburetor cleaner method. This is a 2007 mariner 9. Push choke. In a two-stroke engine, the piston fires (produces power) every time it completes a revolution. Runs only on Choke???. What can or will. I then started it, and on full choke it would idle fine (idle fast that is but that's normal on full choke). Parsun 4-stroke outboard engine, and then some time later I did some research on Parsun outboards in general for a story in F&B. Engine type Forced air-cooled, 4-stroke Operate the generator ONLY outdoors. Rough running only happens at the very end of the stroke (of the choke cable). It will run while the choke is on, and the rpms are up. When your trimmer starts and runs on choke, it could be because the check valve in the gas cap is clogged. My 2007 Mercury (by Tohatsu) 9. Hey all, I just finally finished putting a 4 stroke grubee on my bike (seller called it woodpecker, if that makes any difference) Today I finally gassed it up, and was ready to give it a ride, starting went fine and I was able to turn the choke off and have the engine run. It is the wax/solenoid type of auto choke Sparks are new oil has been checked and is the right level carb has been cleaned pilot tube runs strong and cool fuel is fresh Could anyone shed some light on what might be happening and offer solution(s)?. Whenever I have a carburator problem with a 4-cycle, I take it off the engine.