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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 Flat-Top Piston, Rings, Pin and Clips 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 Keihin PC Carb Includes Extra Main and Pilot Jets for Easy Tuning Also Includes CR Style Throttle, Cable, Air Filter and Top End Gasket Kit Fits the Following Honda Models: CRF50F 2000-2010 XR50R 2000-2010