I have a 15 hp ohv kohler engine it started the other day just fine but now it wont i have spark, fuel and compression it backfires but will not go ahead and. timing issue? if so what can i check
im not sure we just hooked up a plug tester to it.we were wondering if maybe it could be a timing issue? if so what might be some possible issues coil recitifier regulator etc....im not sure we just hooked up a plug tester to it.we were wondering if maybe it could be a timing issue? if so what might be some possible issues coil recitifier regulator etc....
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Make sure the choke is coming off. Check the compression.Many times the head gasket may leak when the engine heats up. Also check for spark sometimes the magneto can heat up and quit after running a while. See if it will run if you prime with a little fuel, if so ,some of the Kohler engines this size have a fuel pump that could be failing. Check for vapor lock. It takes air and fuel properly mixed, spark and compression any of these missing the engine dies.
Have you tried pouring a little fuel into the plug hole and try for start? If it runs for a short time, you have fuel delivery problems. Check the fuel filter for plugging. Look under the carburetor bowl for a small solenoid that commonly sticks in one position. I'm not aware of an automatic compression release on these engines. As this is a 4-stroke engine, it's possible that one of the valve clearances has closed up during use. Check this with the piston at top-dead-center on the compression stroke. Hope some of this helps!
Take the spark plugs out when this occurs and try to pull it through--does it expel fuel or oil? This should tell you whether you have a flooding fuel problem, or maybe the crankcase is overfull of oil causing it to leak into the combustion chamber through worn valve seals or piston rings. Hope this helps!
Check the intake valve springs or the intake valve shafts to be sure they aren't stuck open. Another cause could be excessive carbon build up on the intake valve causing them to not seal.
If you've gone this far, you could try a compression leak down test. If you still have the push rods out, you can use or get an adapter that will allow you to pressurize the cylinder(s) with air by removing the spark plug. Apply 70-80 psi air directly to the cylinder (the cylinder may go to BDC (bottom dead center) but if you don't have any push rods, the valves can't open.
Listen carefully - if you hear air leaking out of the carb, it's a bad intake valve. If you hear air from the exhaust, it's an exhaust valve. If you hear air from the crankcase breather, it's piston rings.
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