- NEW Lightweight high compression CNC machined 67mm piston with rings, pin, & clips
- Head gasket kit - includes the cylinder head o-ring set and an exhaust gasket.

This is our most affordable 67mm bore kit for the YX/GPX/Zongchen engines. Works ONLY with the TB Parts V2 Race Head (other heads have not been tested at this time, always check valve clearances when assembling). The kit includes an all aluminum ceramic plated 67mm cylinder (with skirt) which will increase your engine displacement and power. This cylinder is lighter than a steel sleeved aluminum cylinder, reduces friction (increasing power), improves sealing, and provides better heat transfer (runs and cools down quicker). Additionally, our head gasket kit includes a head o-ring set and exhaust gasket so you don't have to re-use your old ones or make a trip to your local dealer to get new ones and spend more money. This kit is only for the YX/GPX/Zongchen 150cc to 160cc engines with a a KLX110 type topend. 

IMPORTANT NOTE: Installation requires engine disassembly and case boring. Therefore, we highly recommend a professional technician install this kit and the cases bored by a reputable machine shop.