Convert your CRF/XR50 to an 88cc screamer with this complete kit. Everything is included to upgrade the performance of you mini-bike. This kit uses your stock CRF/XR50 cylinder head.
• Aluminum BBR cylinder.
• Special 52mm piston specially designed to work with your stock cylinder head's combustion chamber.
• BBR special grind camshaft take full advantage of the large piston for great performance.
• Special BBR tapered aluminum intake manifold adapts the large carb to the stock intake port size.
• 18mm carb includes extra main and pilot jets for easy tuning
• Also includes CR style throttle, cable, air filter and top end gasket kit.
• Installation available for $200 (plus shipping)
Installation Note 1: Throttle unit included with kit will only work with 7/8" handlebars and will not mount to stock XR/CRF50 handlebars. Stock handlebars are 3/4".
Installation Note 2: 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 combine 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.