178cc 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 Z125 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.
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. Its also recommended that a professional technician make sure its tuned properly once installed. An aftermarket fuel controller is required and possibly an autotune will be needed to prevent a lean condition and damage to your engine. Additionally, a performance exhaust is also recommended as the stock exhaust is restrictive and may cause your engine to run hotter.
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 used in California.