TB Stock Head, 88cc Bore Kit- CRF70

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:

• XR/CRF70

We recommend purchasing a high
volume oil pump kit.

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).