TB Stock Head 88cc Bore Kit - K1-78 Models

88cc Big Bore Performance Kit (52mm): - Lightweight aluminum cylinder with steel sleeve - Cast in mounts on cylinder for aftermarket skid plates - Oversized cooling fins on cylinder for efficient heat dissipation - High compression 52mm piston with rings - pin - & clips - Head gasket kit We recommend purchasing a high volume oil pump kit (available in this section). Installation Note: It will save a lot of time and effort if the oil pump is installed while installing the bore kit (requires cylinder removal).