formline
XS650 Member
Hello, I've installed Mikes XS Large Fin, Stock Piston Kit and now I have REALLY low compression. New stainless valves seated in head, rings installed properly. On a leak down test it sounds like its going in the crankcase. Mikes swears that there is never a problem with this kit. I've pulled the engine a few times and rechecked everything, cam chain to crank, valve clearence etc. The bike runs on the left side with very little help from the right. Question, can a cam chain stretch enough to have valves slighty open even with the cam chain tensioner adjusted? Also I don't remember any honing marks on the new cylinders. I've thought about ball honing the walls and reinstalling. Has anyone else had a problem with this kit from Mikes? Any suggestions?