TB Parts 187cc To 201cc Big Bore Kit For YX/GPX/Zongchen Engines. Case Boring Is Required To Install This Kit! TB Parts 187cc to 201cc Big Bore Performance Kit (67mm).
Ceramic coated all aluminum cylinder (no steel sleeve). Lightweight high compression domed 67mm piston with rings, pin, & clips. Head gasket kit - Now includes the cylinder head o-ring set and an exhaust gasket. The all aluminum ceramic coated 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). This new cylinder along with a complete head gasket kit and domed piston will provide the extra power to make your new bike a lot more fun to ride!
These are high quality parts and definitely will dramatically increase the power and fun factor on your bike! This big bore kit is recommended for use only with our V2 Race Head. For all other applications, please check clearances. This kit is only for the YX/GPX/Zongchen 150cc to 160cc engines witha a KLX110 type topend.The increase in displacement will depend on your stock engine size. On most engines, installation requires engine dis-assembly and case boring. Therefore, we highly recommend a professional technician install this kit and the cases bored by a reputable machine shop. Besides the case boring, the parts are installed in the same manner as OEM parts. Have any questions or concerns? Please send us a message and we will gladly help with any questions you may have. We have been in the motorcycle parts industry for over a decade and are here to help.