Small Engine Troubleshooting Problems? Ask a Mechanic Now.
# ***** is the crankcase breather in the rocker cover. Is it open and venting? Is the oil level correct or could there be gas in the oil? Does it smell of fuel or is too thin?
if oil level and condition is good, and th event is open, then high crankcase pressure has two causes, bad rings and piston, and worn valve guides.
But problem can just be a dipstick.filler cap that is worn and m=not holding the pressure, and there will always be pressure!
did you see my response?