TB 187 to 201cc Big Bore Kit

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!

Important Notes:

This big bore kit is recommended for use only with our V2 Race Head or Stock YX160 style heads.  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.

This product is legal for closed-course competition use only; for racing vehicles (a competition vehicle not used on public highways). Intended for off-road use or race purposes; may not meet regulations of pollution controlled roads or highways. Not legal for vehicles registered and use in California.