I bought a set of harley pistons and cylinders that were taken off a bike for another 110 kit. The person I got them from had it all checked out by a machine shop and everything came out good. Had about 2000 miles on them. They are flat top pistons and the part number says it's the 9.25 to 1 should I just ditch the pistons and get a higher compression piston. I ride above 3000 rpm. I am also going to have my heads done and the 30t pully and cams.