Feedback Score: 0 reviews
Join Date: Jan 2011
Location: Smack in the middle of Illinois
Thanked 282 Times in 277 Posts
Well, I think the guy you bought it off of was an idiot. I am an experienced mechanic - I am self employed and have run my own shop for over 40 years. If the machine were mine, I would tear it down, check the piston to cylinder clearance and check the lower end of the rod. There is absolutely no need to "shave" a standard piston and high compression pistons are shaved to lower the compression for a variety of reasons. I would be quizzing the previous owner as to why the piston was shaved. Typically it costs about $200 per piston for shaving, so I don't believe it was done unless the PO was serious about racing.
If the big gear was not replaced, the hub that locks up in the starter clutch may be worn down to the point it is slipping. Sometimes if put the engine in gear and roll it backwards a little, it will lock the starter clutch and spin the starter backwards, then sometimes it will crank the engine normally once or twice more. Might try that and see what happens.