Got to bore anyway, is there any advantage (or disadvantage) by going with Wiseco pistons?
The going price for yamaha pistons a around $95.00 but dosen't say if that is with rings. piston,rings and pin from Wiseco is $135.00. Do you know if Yamaha's price might be with rings (a least)?Don't think it matters as long as you run the same in all cylinders. Guys that have had the problems are the ones putting in a different piston type in 1 cylinder than what is in the other 1 or 2. Weight differences, different piston design, etc., will eventually cause problems.