I took top bend off my kx500. 87 model. Used. Doesn't have the electro fusion cylinder in it .some one put a sleeve in it . A magnet will stick to it . Also piston is different that stock . It has a newer style double set of rings . My question is I measured the cylinder with a micrometer. Measured 87.85 mm. Piston measured measured 87.35. The Wiesco position says 2.00 mm I assume that means 2 over stock . That would be 88mm right. Want to do a top end rebuild. Does the cylinder has to bored to 88mm or can I just get a new piston and what size ? Thanks for help.