I find out today that the bike already has a Wiseco 10.25:1 piston in it. This makes my compression test of 123 psi even worse than I originally thought. I lapped the valves and rebuilt the head. When I start on the cylinder hone then ring gaps I found that they were not good and needed work (build halted). I don’t have the best micrometers to measure the bore. My best measurements of the bore have it at around 81.4mm at the top. I feel that this piston is serviceable and if someone on the boards wants it, I will send it or trade it. It is my desire to go back to stock compression ratio and I likely need to have the bore cut to fit the piston I find or buy for it. If someone has an 81.5 mm or 82.0 stock piston, I would be happy to trade this Wiseco piston for it.

I can email or text a picture of the Wiseco piston if you PM me. I can also mic the unit as well. The part number is 4393M08150. The piston pin checks out according to service limits and I will keep the piston pin. There was very little carbon build up on the top of the piston (I cleaned it off).

I am still looking for a picture hosting site that works easily and I have yet to find a good one.

Polymerjohn