I have a 15hp B+S in a Craftsman. As it was running the motor started to slow down like it was under a strain. I shut it off. I checked the oil and there was oil right up to the top of the stick which seemed strange. I cleaned the stick and check the level which was ok. I tried to start it and it would only turn 1 rev. barely. I took the engine cover off and can turn by hand. I tried jumping it and still the same. I notice it would turn, using the battery to a certain spot and then stop. I have a spark. I don't have any oil on the plug or top of the piston. The fly wheel is new as of last year. That was the last work done on it.
Any clues?
Any clues?