170cc Stage1 Kit
170cc Big Bore Kit: - All aluminum ceramic plated 64mm skirtless cylinder - Lightweight high compression 64mm piston with rings, pin, & clips - Head gasket kit - includes the cylinder head o-ring set and an exhaust gasket. This is our most affordable 170 bore kit for the YX150/GPX150 engine. Works great with your stock YX150/GPX150 head or our new V2 Race Head. The kit includes an all aluminum ceramic plated 64mm skirtless cylinder which will increase your engine displacement to 170cc. Additionally, our head gasket kit includes a head o-ring set and exhaust gasket.The new bore kit consists of high quality parts and requires no machining to the cases - bolt on and go!