Originally Posted by kymowboy
The engine was laboring but kept chugging along. Pulled the head and found a ridge in the combustion chamber, my guess is a crack in the die at the foundry. One, or some, of the peaks was making a hot spot that ignited the gas. Massaged the head with a D/A to make everything smooth and reassembled. The problem went away.
The ole dieseling 4 cycle trick....Got to get them pretty hot to make them run on their own...
I heard once...though I never tried it..If you spray a mist of water into the carb while the engine is at WOT...it will loosen up those deposits and blow them out the muffler..???