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Larger intake and exhaust ports
Shorty Brake Lever
This cylinder head offers many upgrades over stock that allow your engine to make more HP everywhere and turn even more RPMs
High performance
Shot-peened solid rollers and chromized pins help to extend service life
Boyesen Factory Ignition Cover Color:Black Larger intake and exhaust portsElevate your bike's performance with the Boyesen Factory Ignition Cover. Precision cast from high quality aluminum for perfect sealing against dirt and moisture. This premium cover includes gaskets and delivers that professional "WORKS" look riders crave. Designed for durability and performance, it's the essential upgrade your XR CRF50, XR CRF70, or Z50 deserves.