Cylinder Works Big Bore Kit Crf250R/X '04-08 - 11001-K01
*Honda CRF250R and CRF250X require slight case modification. Kit comes with instructions.
‡Two stroke replacement rings are sold individually (Example if your piston has two rings you will want to order two rings)
+Yamaha YZ85 cylinder head modification required.
# Yamaha YZ85 cylinder head modification required, AND +2mm strocker crank required.
PROP 65 WARNING: Cancer and/or reproductive harm - www.P65Warnings.ca.gov