- Complete standard bore kits
- Complete standard bore high compression kits
- Complete Big Bore Kits
- Includes cylinder, piston kit and gaskets
- Top end gasket kit does not include valve stem seals
- Matched with vertex pistons to ensure longevity, performance and reduce engine noise
- Replacement piston, gaskets, and ring sets available
- Cylinder looks just like stock
- Nickel silicon carbide plated for longer life
- No machine work needed *
- Replacement cylinder for standard bore only
*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 Item may contain compounds or chemicals known to the State of California to cause cancer and reproductive harm.