Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi Kerry, my name is***** will be assisting you.
I believe that you are headed in the right direction by checking and resetting the valve clearances. This is really the only thing that might cause the unit to backfire through the intake like that. You should be able to turn the flywheel manually by hand in order to check or reset the valve clearances. You could have an ignition coil misfiring that would cause the problem as well. I would check the valve clearances as a starting point and go from there.
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Yes, it does sound like the number two cylinder is not running or firing. Have you checked to see if you are getting a good spark to both cylinders. I know that #1 is probably okay but you can use it to compare to #2 and see what if any difference you have. I have seen the ignition coils on these engine be a problem. Normally if I were replacing them I would replace both of them at the same time. It could be that #2 is firing some of the time but not all the time which would explain the backfiring and load up of fuel in the intake and cylinder. By the way most likely what you are seeing in the intake a cylinders is fuel not oil.
It sounds like the #2 is not firing correctly. You could have a compression problem, valves not sealing properly or a head gasket partially blown.
That will be fine. Let me know what you find.
Compression looks good at the numbers that you have indicated so I would agree that it does sound like an ignition coil acting up and not firing properly.