does it have the manual compression release pull for easy starting? I was goingg to suggest worn cam lobes, but you covered that. any chance the compression release mech is hanging up and keep the exhaust valve from closing?
Tossing out ideas
float height?
float needle and seat mismatch to the fuel pump pressure?
plugged up exhasut/muffler?
crankcase pressure not venting?
fuel tank vent clear?-- matter of fact, that was the cause of very similar symptoms with one of my 18hp kohler mower engines. Start fine, run awhile but n opt full power, get hot, stall and not want to restart.
Last edited by x-bird; 04-30-2015 at 10:13 PM.
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