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Engineered and developed by BBR. This cylinder retains skid plate mounts and includes: BBR aluminum cylinder, piston kit, and gaskets. Custom piston designed specifically for the OEM Honda XR/CRF70 cylinder head . The most reliable kit available. Runs great with stock carb or bolt on BBR's 18mm carb kit.
Note: Do not use this bore kit with the OEM Honda XR/CRF50 cylinder head. This piston dome is too tall and will hit causing damage to your engine. Use our bore kit intended for that cylinder head: Bore Kit - 88cc W/Cam / XR/CRF50, 00-Present