Part # 411-HXR-5500
Impressive Power. Engineered and developed by BBR.
This cylinder retains skid plate mounts and includes: BBR aluminum cylinder, piston kit, exclusive BBR motocross-grind camshaft and gasket kit.
Easy bolt-on instructions included.
The most reliable kit available. Runs great with stock carb or bolt on BBR's 18mm carb kit.
â¢ Cylinder retains skid plate mounts
â¢ BBR aluminum cylinder
â¢ 52mm piston specially designed to work with your stock cylinder head's combustion chamber.
â¢ MX-grind camshaft
â¢ Gasket kit
â¢ Easy bolt-on instructions included
Installation Note: This kit will not work with the Honda XR/CRF70 or other big port cylinder heads.
It is designed for the tiny combustion chamber of the OEM Honda XR/CRF50 cylinder head.
The flat top piston dome will result in an extremely low compression ratio when combined with the XR/CRF70 type cylinder head.
The result is a motor that makes less horsepower than stock. BBR Does not currently make a big bore kit for the XR/CRF70.