CRF70 / XR70

Honda CRF70 / XR70 Big Bore Kits

Upgrade your Honda CRF70F or XR70R with big bore kits from TB Parts. The CRF70 and XR70 are beloved classic mini trail bikes, and a bore-up kit is the most effective single upgrade you can make for more power and performance.

CRF70 / XR70 Big Bore Kit Options

TB Parts offers big bore kits for the Honda CRF70F and XR70R that include a bore-up cylinder, piston, rings, and gaskets. More displacement delivers noticeably more torque for trail riding, pit bike racing, and play riding. Available in multiple displacement options.

Performance Cams & Engine Parts

Pair your CRF70 or XR70 big bore with a TB Parts performance camshaft for maximum power gains. Also stocked: cam chain tensioners and other CRF70 engine parts. Contact Hard Racing at 704-799-2192 for build guidance.