• Complete standard bore kits
• Complete standard bore high compression kits
• Complete Big Bore Kits
• Includes cylinder, piston kit and gaskets
• 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' standard bore only

*Honda CRF250R and CRF250X require slight case modification. Kit comes with instructions.

+Yamaha YZ85 cylinder head modification required.

# Yamaha YZ85 cylinder head modification required, AND +2mm strocker crank required.