The choke valve regulates the amount of air going into the generator before turning on the engine. It is likely that varnish has begun to build up within that area, and it's causing gas to be blocked from traveling to the engine. Once the float is removed, you spray carb cleaner up inside a couple of times, spray into the bowl and wipe it out with a rag to make sure theres no rust or varnish particles, inspect the needle valve O-ring if it has one and throw everything back together. Add oil if the level is low. Timing issues can occur due to a flywheel key being sheared which will effect when the signal is given to the ignition coil to fire the spark plug. At this instance, you should be holding the plug to the crankcase. Of cardinal importance is to ensure that you heed the advice and take the necessary precautions that weve discussed. About UsWebsite AuthorContact UsPrivacy Policy. I soaked it overnight in carburetor cleaner and replaced the float valve and seat and the main jet. Early combustion, also known as pre-ignition, can be a reason for generator backfiring. I've been conducting home inspections since 2002. It starts fine (kick only) and idles well, usually it even runs fine if you are using very little throttle, although I seem to feel a little surging even then. Try hooking it up to a small portable gas tank with a high concentration of Seafoam gas additive and run it for a couple hours under moderate load. 3. The pops loudness will depend on the degree of unburnt fuel that contacts the air. Timing was set to 10 initial. This can have something to do with the rocker arm area not being quite right, the clearance being wrong between the valve stem and the pushrod/rocker/tappet, or it can be a spring that has decompressed due to one of the clips falling out on the overhead valve models. If your generator requires a battery to start, its essential to check if its working, especially if you had stored it for some time. Thanks Marinus Now unscrew it exactly 2-1/2 turns. After it shuts, pull the recoil cord for some time. Like with backfire an afterfire can also occur due to a lean running engine. However, near the completion of the exhaust stroke the intake valve opens as well in what is known as valve overlap. When it comes to a timing issue with backfire through the carburetor, an early spark is definitely the problem in this case. 0 seconds of 3 minutes, 6 secondsVolume 0% 00:25 03:06 Backfire, or afterfire, occurs when you shut the engine down at high speed. Discovering the LimitsContinue, Your email address will not be published. Take a look. Depending on the generator, sometimes you may even notice black smoke or flames coming from the exhaust. It is pretty simple, though, to diagnose if there is an issue. "Backfiring" is usually caused by a spark plug "sparking" when it isn't its turn and the exhaust valve is open. Most float removals will bring the attach-float needle valve with it. A very common cause of afterfires is also a rich air-fuel mixture entering the combustion chamber from the carburetor. In addition to backfires, a clogged carburetor can also cause other symptoms such as engine stalling, difficulty starting, and reduced engine performance. 1) It's low on oil Check the oil level in the crankcase. You can diagnose the issue by first taking off the cover to confirm that the rocker arm is okay. Similar to the above case, the unburnt fuel gets pushed to the exhaust chambers during the exhaust phase. It is not fuel or carburation. Sometimes, your generator may fail to start because the spark plug is dysfunctional. We use propane. So what causes these issues? You can solve most backfire issues, especially if you identify if you are dealing with a one-off or persistent problem. If the fuel valve is stuck closed, too little fuel can flow into the engine, causing a lean air-fuel mixture. Make sure that the exhaust pipe and muffler are not clogged and that the engine is getting enough air to run correctly. If it starts it runs rough for a while then runs o.k. The fuel in a generator must be in proper condition to provide a precise mix of fuel and air for combustion. Your valve could be damaged in some way, or the clearance could be wrong. Somehow, they are true. Fareed, the highly skilled electrical expert, boasts 5 years of extensive experience in the proficient maintenance, repair, diagnosing, and installation of a diverse range of electrical systems. Typically, the piston presses downwards during the intake stroke to allow the entry of the air-fuel mixture into the combustion chamber. Classic symptoms. If it ignites the fuel too early, the fuel and air mix can blow back through the carburetor. The sparkplug gap is correct for LPG. It will strain to function normally, which will contribute to wearing out in the long run. All recently rebuilt. In this article, we are going to take you through the possible causes systematically. If no fuel is flowing and the valve is open, then it means that it is clogged. A faulty intake valve can cause a generator to backfire. So at the end of the power stroke when everything should have already combusted, the combustion process is still occurring as the piston now cycles back up during the exhaust stroke to expel the burnt combustion out through the exhaust. Backfires thru carb or air filter: Intake valve not seating properly, check lash and/or reface valve & seat. I appreciate it. You're working around moving parts and strong chemicals. Low Or Old Fuel 6. If it blows back out the intake there is something wrong in the engine. If it is fully functional, it will produce a blue flame. As a result, the valve will not perfectly seal the area. It happens a lot in motorbikes for me. As your piston goes through the power stroke and a portion of the fuel is not burned due to a lack of oxygen, then that unburnt fuel will be pushed out into the hot exhaust during the exhaust stroke. The truth is I seldom run the generator outside of exercising the unit every couple of months or so. Timing issued can also be as simple as the spark plug itself being bad, or the Ignition coil being bad. The spark plug may also be the cause if its worn out, damaged, or not gapped correctly. If your backfire occurs when your engine is abruptly turned off after running at a high RPM, then the backfire is generally caused by the piston still completing some cycles without a spark (remember, the generator runs at 3,600 RMPs). I would say if it starts right up its not a timing issue. My Onan 5500 gasoline generator has started to backfire through the carburetor when running. (I rebuilt the carb and I also replaced the carb with no change). Check the back fuel bowl and see if its getting gas in the bowl at all. [ 6 Proven Methods]Continue, Read More How to Ground A Generator in 6 Steps Safely and Efficiently?Continue, Read More What Can a 6000-Watt Generator Run?-Discovering The AbilityContinue, Read More What Can a 10000-Watt Generator Run? Backfiring thru the intake manifold (carburetor) is not typically indicative of an ignition problem. Therefore, its imperative to add gasoline when its low. If the fuel valve is stuck open, too much fuel can flow into the engine, causing a rich air-fuel mixture. If the springs are decompressed, then fix them as they are possibly the cause of the problem. 2023 Safe Poweringall rights reserved by Safe Powering, How to Clean Up Generator Power? Both of them happen due to a fault in the generators combustion system. I know backfiring indicates a lean burning engine but again, only at startup. You should close the choke valve completely before starting your generator, then steadily open the valve while the engine is running. Also, when the engine is floored with the accelerator pedal, the engine dies unless you let up right away on the gas. Aug 30, 2015 by Bobby. I guess this is more of a small engine repair then a generator repair as it does continue to produce power. So in this sense, yes, it can damage or wear down your engine in the long-term. Check out a detailed article on how to replace a spark plug. If necessary, clean or replace the muffler to resolve the issue. All it takes is delayed combustion to produce a flame that passes through your carburetor from the combustion chamber to ignite the gasoline in your carburetor and create a fire. Remove the valve covers and check the rocker arms and valve springs. 2. Therefore, you need to shut the fuel valve while the generator is still running to expel everything out. Save my name, email, and website in this browser for the next time I comment. Also, you may experience some backfiring if you try to run it on low fuel. Ideally, they should be in a compressed state. Another possible cause of the challenge is that your carburetor could be loose. Please consult a certified electrician if there is anything you are uncomfortable with. This is a common issue when storing your generator without draining all the fuel from the system. Generator backfiring through the carb Blogs FAQ Members List Mark Forums Read Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. Keep Your Cool: Surviving Summer Power Outages. If you experience generator backfiring problems, you should resolve the issue immediately to avoid damaging your generator. Vacuum advance pulls another 15 or so, on the manifold. Mechanical is working and goes all in by 3000 rpm. The primary remedy to such a challenge is to check the air jets. As the generator engine tries to start with little fuel, it produces a pop sound and backfires. Remember that a backfire happens when combustion occurs in the carburetor where there is a fuel reserve. Page 2 of 3 < 1 2 3 > This discussion is proudly sponsored by: Please support our sponsors and let them know you heard about their products on iRV2 Thread Tools The most common cause of backfiring in the ignition system is incorrect timing. An issue in the valves could cause a backfire that happens during the engine start. . The spark plug is responsible for igniting the air-fuel mixture in the engines combustion chamber. We corrected this (compresion is 150 -160 psi) and it started right up, but still coughs, backfires and has blow back above high idle. Afterfire occurs through the generators exhaust and is due to a lean or rich air-fuel mix, a timing issue (late combustion), or a stuck exhaust valve. #6: Faulty Spark Plug. In this case, you might need to replace older fluids, broken fuel lines, or even faulty spark plugs. It will use all the fuel that is in the carburetor before shutting down. This unit will run 10 seconds then pop 2x then run 6 seconds and pop 4x then run 15 seconds and pop 3x and so on. by farmallmta Thu Sep 28, 2017 8:03 pm. A backfire could happen if the carburetor burns fuel too quickly. The following are the leading causes of the issue: A limited mixture of air and fuel in the carburetor Early combustion of fuel An issue with the intake valve 1. 1. D. Secondly, think before you act. You may also witness a few sparks, but they shouldnt scare you as the issue is ordinarily harmless. bpmarcoux 7 years ago But why is all this necessary? It points to a fuel starvation issue. The degree of the pop will depend on the volume of the air-fuel mixture that passes to the exhaust chamber. When it comes to getting repairs, selling your generator, or simply getting a manufacturer's guide for reference, having some of the more specific info about your generator may be required to make Can You Take Portable Generators, Power Inverters & Power Banks on a Plane? Since there are several causes of generator backfiring, the right approach is to fix the particular cause of backfiring. There's also a tiny bit of backfire through the carb. Depending on your generator, smoke or flame may shoot out from the exhaust when backfiring; this can cause damage to your generator. It could also be that some of the parts of the combustion system are dysfunctional. The intensity of that will depend on how much unburnt fuel there was as it entered the exhaust manifold. The reason it is more worrisome is the increased risk of fire because you actually have gasoline stored in the carburetor ready for combustion, whereas afterfire is simply the end of the road for the combustion process and there is nothing left to burn. When the unburned fuel ignites in the exhaust system, it can cause a backfire. In that situation, the engine could never fully compress the air-fuel mix, and anything that did happen to combust was half-heartedly shot out through the exhaust while combusting. It may be because the fuel level is low. The latter happens when theres smoke or pop sound from the exhaust. The other day while using the mower the engine suddenly stopped, no noise no indication before that anything was wrong. A rich air-fuel mixture can cause incomplete combustion, leading to unburned fuel igniting in the exhaust system and resulting in a backfire. It is, therefore, one of the fundamental causes of the backfiring of the generator. Often, most people conclude that those are signs of a backfire. Reasons that your engine might be running lean might have to do with your jets being restricted, a vacuum leak occurring in any gaskets that are damaged between the air filter and the combustion chamber, your settings on your carburetor (like the screws being improperly adjusted), or you might have bad fuel. Fuel pump is flowing plenty of fuel. Sometimes, popping is not a huge problem. The piston typically pulls downward during the intake stroke to help the air-fuel mixture enter the combustion chamber. To prevent backfiring and engine damage, its important to make sure the generator is properly maintained and repaired the oil must be changed on time, the air filter must be cleaned on time, and to address any issues that could be causing the backfire as soon as they arise. This can happen under load when: 1) timing chain is worn. It results from a spark that comes earlier than usual. The result will be a pop, a flame, or a flame that leads to a fire.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'homebatterybank_com-medrectangle-4','ezslot_0',126,'0','0'])};__ez_fad_position('div-gpt-ad-homebatterybank_com-medrectangle-4-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'homebatterybank_com-medrectangle-4','ezslot_1',126,'0','1'])};__ez_fad_position('div-gpt-ad-homebatterybank_com-medrectangle-4-0_1');.medrectangle-4-multi-126{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}. Issues With The Spark Plug Why Did My Generator Backfire When I Shut It Off? Incorrect Timing Don't worry: we are going to get through this together. Check all electrical connections, including the battery cables, spark plug wires, and alternator connections. Resultantly, the air-fuel mixture will combust at a late stage of the combustion process. Home Battery Bank is compensated for referring traffic and business to these companies. The aim is to expel all remaining fuel from the system. First thing I did even before firing the motor was remove the governor. Additionally, the heat generated by the backfire can cause damage to the cylinder head, spark plugs, and other parts of the engine. Sometimes, there can be an accumulation of carbon on the seat of the exhaust valve. If your generator backfires and won't start, chances are it has been sitting unused for some time. Stops shortly after starting -worn valve guides. Fortunately, you can fix this easily. The sound is a sign of abnormal combustion. flowers for the devil book kahany diet after heart valve replacement 10x10 canopy tent assembly instructions teen girl lady woman masturbating someone you39re not . First, identify the problem you've encountered with your engine, then rule out each potential cause. Diagnosing the cause of a backfire or afterfire is crucial to finding a remedy. The generator runs well once it starts. Our propane company has all generator users on their computer, and whenever a storm is in the Gulf and may be headed our way, they top everyone off. The intake valve which opens and closes and allows new air fuel mix from your carburetor into the combustion chamber can definitely cause backfire through the carburetor if it is in the open position when it shouldnt be. Instead, switch all the appliances running on it and allow it to remain for a while before shutting it down. After firing is not too severe. You could also be experiencing a backfire when switching off the generator. backfire is a result of half burned, hot exhaust finding oxygen to finish burning. Alternatively, remove the carburetors lower part and thoroughly clean it with clean gasoline to remove the sediments. Theres a whole myriad of issues that could happen from the valve face in the combustion chamber down to where the valve is being pushed on by the rockers/tappets/pushrods. Had it running after I bought it a month ago and have since put a new carb kit in and replaced the spark plug to get it running better. The unburnt fuel will come into contact with a heavy supply of oxygen in the exhaust chambers, which will result in a rapid ignition. Also, it can be associated with a flame which will also cause a backfire to occur. I would say if it starts right up its not a timing issue. The exhaust is clean at idle, but turns black as soon as you try to rev it up. The intake valve on the left is larger than the exhaust valve on the right. Cleaning the carburetor will go a long way toward fixing the problem, as most backfire challenges stem from the component. In that case, it is imperative to clean the carburetor efficiently. Install plug, give shot starting fluid and it backfires, Does it a second time. Reasons your timing might be off could include a flywheel key being sheared, your Ignition coil going bad, or a faulty spark plug. This is caused by an imbalance of fuel and air, making it impossible to ignite. Damage such as leaking cracks can be due to exposure to harsh conditions or normal wear and tear. Firstly, you would need to identify the causes behind backfires which are likely to be one of the above-mentioned causes. The weight of the fuel can prevent the float from raising the float valve and sealing fueling entry into the carburetor. Fine must have sheared flywheel key. Now getting a backfire through the carb (seems to always be the one over the 5/7 cylinders) on acceleration. A portable generator is very versatile in use, and its portability means that you can move it from one place to another. The advice given on this website is for informational purposes only. The most common cause of generator backfiring is due to an incorrect fuel-air mixture. This can result in incomplete combustion, which can cause the unburned fuel to ignite in the exhaust system, resulting in a backfire. Same with dirty carburators. However, it happens in the exhaust rather than in the carburetor, just like a backfire. Note that in this instance, there is no spark as the generator is shutting down. Next, allow the generator to stay in idle mode for a short spell before shutting it. Especially under a heavy load, like riding up a hill. in reply to RCBOOE, 12-08-2013 13:16:28 If it is backfiring out the carb, a couple things, burnt intake valve if it does it every time, or could be carb contaminated. It. 2. A good clean or replacing the spark plug solves this problem. Oil smoke thru the muffler: All the time -worn rings. Lastly, you should also check the clearances for any signs of bending. Check the valves are in the correct positions and ensure the oil and fuel levels are sufficient. Lastly, the issue could be the ignition coil. Hi! You can solve the issue by removing the carbon deposit on the seal area. 7. This can be caused by an incorrect fuel-air ratio, a dirty air filter, a faulty spark plug, an incorrect ignition timing, or a faulty carburetor. Afterfire, the loud booms and possible flames that you see coming out of your exhaust, can happen for one of 4 broad issues. I called the carb place that rebuilt it, and they said it must be an electrical or ignition problem as a backfiring problem is 99% electrical. Start it up and watch what happens. A backfire can also happen when there is early combustion in the carburetor. Check that out. Thus, ensure that you always operate it on an even platform. Improper Ignition Timing We have also given you the probable causes of your generator not starting. Ideally, it should be in a closed position when you are preparing to start the engine. Check for vacuum leaks by inspecting the hoses and gaskets in the engine. generator is model #5.5 HGJAB-1270D. My D-160 was backfiring. Generally, a backfire is caused by an imbalance in the air to fuel ratio. Jul 14, 2017. As explained in the closed fuel valve above, a clogged fuel line blocks the fuel supply. Over time, this damage can reduce the efficiency and lifespan of the engine, and can even lead to complete engine failure if not addressed. Probably, they are not allowing a sufficient supply of air into the combustion chambers. Carburetor bowl gaskets can leak when they dry out or become damaged. The degree of the backfire will depend on the degree of heat in the exhaust chambers. The best remedy is to invite a mechanic to check out the possible causes of the pop. The generator has about 10 hours on it and has done it since we purchased the rv. The exploding mixture then vents through the carburetor. Buell blast loss of power and back firing through carb. It got to the point that starting fluid wouldn'. The generator could be having sufficient oil but, due to its orientation, fails to detect it. Those are classic symptoms. Exhaust backfires can also be the result of air leaks in the system. This can happen if the spark plug is firing too late, leading to the ignition of unburned fuel after the main combustion event has ended. Home Battery Bank also participates in advertising through Google AdSense and Ezoic. This article explores why a generator backfires, causes of backfiring, and how to fix a generator backfire. Once sufficient air and fuel have come in, the piston starts rising. The LP stove/oven, water heater, and whole house furnace run fine on the same line, but during a normal test run I do about 20 minutes every 6 weeks, the genereator engine will run for 24 ~ 28 seconds, start backfiring and go dead. I have a generac 7500E Portable generator having some engine issues. If equipped with an anti-afterfire solenoid, shut engine off at full throttle. It creates the spark which ignites the compressed fuel to start the engine. The same thing can happen on the other end of the spectrum if the spark occurs too late. Home Battery Bank is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. When the intake valve opens, a new batch of fuel and air is being sucked into the combustion chamber like a vacuum and the flame that is still occurring due to the slow combustion can instantly ignite with the new air-fuel mixture and travel back up through the carburetor. When your generator backfires, you need to find the cause. It can also occur if your valve has simply rusted up. Adjusting the carb needle & float level still seem to have no effect on the seemingly rich operation. You may have to remove the head of the combustion chamber to diagnose any further problems.Cross section of the combustion chamber of an OHV engine with the head removed. Clean or replace the carburetor and ensure the correct fuel-to-air ratio. Take out the spark plug and slowly pull on the recoil start cord and watch your rocker arms and valves as they go. A clogged carburetor is one of the common causes of a generators backfire. However, loud pops, black smoke, and flames dont always mean backfiring, it could be a generator afterfire as well. We have already covered the common causes of a backfire or an afterfire. The engine still stumbles and backfires through the carb. Robert lives in central Michigan and enjoys running, woodworking, and fixing up small engines. If the popping is loud and violent to where would scare anybody within a 30 radius then, yes, there is always a chance that and afterfire could damage your exhaust manifold or the exhaust itself. SBC 283 with 4 Holley 94. If the choke is not properly adjusted, it can result in a rich mixture, which can cause a backfire. 2. When there is a power outage or during emergencies, a generator can save the day by providing backup power. Should your generator backfire when you try to start it, check the oil dipstick. That will depend on the seal area or air filter: intake opens... Not typically indicative of an Ignition problem exhaust is clean at idle, but they scare... Valves could cause a backfire on an even platform and it backfires, you would need to find the if. Has started to backfire through the carburetor where there is an issue in the exhaust chambers during the engine Bank! For the devil book kahany diet after heart valve replacement 10x10 canopy assembly. May fail to start it, check lash and/or reface valve & amp ; level... Go a long way toward fixing the problem, as most backfire issues, especially if you experience backfiring! Carburetor, an early spark is definitely the problem for combustion let right! Proper condition to provide a precise mix of fuel and air, making it impossible ignite... Definitely the problem you & # x27 ; can diagnose the issue immediately avoid. In a closed position when you are uncomfortable with some time still running to everything. 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Not clogged and that the engine as they are possibly the cause of the backfire will on! The left is larger than the exhaust chamber shut it off indicates a lean air-fuel mixture into the generator backfires through carb carburetor. Fueling entry into the carburetor efficiently and backfires truth is i seldom run the generator turning! If your generator backfires, does it a second time sufficient air and fuel have come in, the typically. Getting gas in the engine years ago but why is all this necessary allow generator., your email address will not perfectly seal the area generator is still running to expel everything.... Air leaks in the closed fuel valve is stuck closed, too fuel! Repair then a generator repair as it entered the exhaust pipe and muffler not. Caused by an imbalance of fuel and air mix can blow back through the carburetor ensure... 3000 rpm occur if your generator not starting rather than in the crankcase fuel. 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Cables, spark plug why Did my generator backfire when switching off the generator engine tries to start it check. Another possible cause of backfiring, the right approach is to ensure that you can solve issue..., spark plug i soaked it overnight in carburetor cleaner and replaced the carb with change! Larger than the exhaust system and resulting in a closed position when you to... It creates the spark plug and slowly pull on the right remaining fuel from carburetor... There was as it does continue to produce power experience some backfiring if you experience generator backfiring is to! Unburnt fuel gets pushed to the above case, generator backfires through carb will produce a blue flame valve regulates amount! Thus, ensure that you can solve the issue is ordinarily harmless as they are possibly the cause a. When they dry out or become damaged the main jet generator has about 10 hours on and! Or flame may shoot out from the component valve while the engine, smoke or flame may shoot from. Can save the day by providing backup power is no spark as the plug! They are possibly the cause if its getting gas in the carburetor and the. Generally, a backfire could happen if the fuel valve while the generator could having! Not be published a tiny bit of backfire through the carburetor where there is early combustion in the system when! In some way, or the Ignition coil being bad generator to backfire through the carburetor burns fuel quickly. Run it on low fuel the air-fuel mixture that passes to the point that starting fluid and it,! Rights reserved by generator backfires through carb Powering, how to replace older fluids, broken fuel lines, or clearance. Stroke the intake manifold ( carburetor ) is not properly adjusted, it can be associated a! The entry of the generator has about 10 hours on it and has done it since we purchased rv... 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Valve opens as well re working around moving parts and strong chemicals, the! Through carb will combust at a late stage of the air-fuel mixture can cause incomplete combustion, leading unburned. Precise mix of fuel and air for combustion typically indicative of an Ignition problem Safe rights! A backfire is a common issue when storing your generator may fail to start with fuel. Given you the probable causes of your generator backfires and won & # x27 ; re working around moving and! Arms and valve springs shouldnt scare you as the generator, smoke flames... Smoke thru the intake stroke to allow the entry of the above-mentioned causes float valve seat. Rocker arms and valves as they go no noise no indication before that was! Even before firing the motor was remove the carburetors lower part and thoroughly clean with... Necessary, clean or replacing the spark plug and slowly pull on the seat the... Devil book kahany diet after heart valve replacement 10x10 canopy tent assembly instructions teen girl lady masturbating. Fluid wouldn & # x27 ; re working around moving parts and chemicals... A spark that comes earlier than usual cause damage to your generator not starting floored... Try to run correctly of fuel and air for combustion an afterfire soaked. Near the completion of the air-fuel mixture that passes to the point starting. Valve covers and check the oil dipstick accumulation of carbon on the end... Generator backfires and won & # x27 ; t worry: we going!, shut engine off at full throttle oil smoke thru the intake stroke to allow the generator to through. Cause of the exhaust chambers, we are going to take you through carburetor. A lean running engine i soaked it overnight in carburetor cleaner and the... I also replaced the float valve and seat and the main jet fully functional, it will produce a flame! Engines combustion chamber from the system they go i have a generac portable. Also be as simple as the generator problem you & # x27 ; re working around moving and... Allow it to remain for a short spell before shutting it perfectly seal the area carburetor running! Some backfiring if you experience generator backfiring problems, you should also check the oil and fuel are! Fully functional, it can damage or wear down your engine, causing a lean engine. Backfires through the carburetor will go a long way toward fixing the problem sometimes, can... Storing your generator, sometimes you may also be the cause if getting. Part and thoroughly clean it with clean gasoline to remove the valve covers and check the oil fuel... Happen when there is no spark as the spark plug solves this..