TB Stock Head, 88cc Bore Kit – CRF50

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 Fitment: Honda Z50 1988-1999 Honda XR50 All Years Honda CRF50 All Years We recommend purchasing a highvolume oil pump kit. Installation Note: It will save alot of time and effort if the oil pump is installed while installing the borekit (requires cylinder removal).