thanks for the replys,carb was replaced 5 years ago,i should have taken that as a sign of things to come,the idea was to take it apart put a set of rings in to cure the smoke coming out of the exhaust and the push rod tube o rings that were leaking,cyl was pretty rough,figured i would have to get it bored out .020 and a new piston and rings,but as i was looking at the crankcase end of the cyl,there is crack about 4 in long behind where the starter mounts. looks like i need a new cyl, doug