Question about Kohler CH25 PA-CH730-0040 Command Gasoline Engine
The engine ran great until it came time to shut down it then back fired and ran on after I shut it off.The next time I started it, it ran slower and slower then died.It has no compression in either cylinder and occasionally backfires but won't start.The fuel pump is new and the carbs been cleaned there's enough fuel.
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Posted on Jan 02, 2017
Have you checked for a bad head gasket?
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.
Posted on May 03, 2009
If the engine is running rough then this could mean that you have weak spark or valve adjustment. When an engine runs rough it will not burn all the fuel, which will create excess fuel in the air cleaner housing. Also, make sure the the float is closing in the carberator.
Posted on May 07, 2009
ALWAYS CHECK THE POINTS!!! 20 years operating this engine and you'd think I would know better. The points were severely pitted. Spec said .020 but actual is .013. The cold weather had me suspecting a carb problem. DOH!
Posted on Jan 14, 2010
The woodruff / flywheel key is likely partially sheared. Pull off the air housing, remove the starting clutch, to get to where you can see the flywheel key. I bet you will find that the key has distorted. Easily replaced once flywheel is pulled. Make sure to use the correct key when replacing it.
Posted on Jun 12, 2010
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