Engine

Includes cylinder, piston kit and gasketsMatched with vertex pistons to ensure longevity, performance and reduce engine noiseReplacement piston, gaskets, and ring sets availableCylinder looks just like stockNickel silicon carbide plated for longer...

Includes cylinder, piston kit and gasketsMatched with vertex pistons to ensure longevity, performance and reduce engine noiseReplacement piston, gaskets, and ring sets availableCylinder looks just like stockNickel silicon carbide plated for longer...

Includes cylinder, piston kit and gasketsMatched with vertex pistons to ensure longevity, performance and reduce engine noiseReplacement piston, gaskets, and ring sets availableCylinder looks just like stockNickel silicon carbide plated for longer...

Includes cylinder, piston kit and gasketsMatched with vertex pistons to ensure longevity, performance and reduce engine noiseReplacement piston, gaskets, and ring sets availableCylinder looks just like stockNickel silicon carbide plated for longer...

New replacement cylinder headIncludes cam caps and cam cap boltsIncludes C630 (nickel/aluminum/bronze) valve seats and guidesCompetition valve jobShortened valve guides to accept higher lift camsUnshrouded combustion chamberBlended bowlStock shaped...

Cast from the highest quality aluminumSeals perfectly to keep out dirt and moistureCovers come with gasketsHolds clutch cable more securely (Yamaha YZ models)Give your bike the factory "WORKS" lookCover gaskets may be used with stock or factory covers

Cast from the highest quality aluminumSeals perfectly to keep out dirt and moistureCovers come with gasketsHolds clutch cable more securely (Yamaha YZ models)Give your bike the factory "WORKS" lookCover gaskets may be used with stock or factory covers

Cast from the highest quality aluminumCovers come with the gasketsSeals perfectly to keep out dirt and moistureGives your bike the factory “WORKS” look

Cast from the highest quality aluminumCovers come with the gasketsSeals perfectly to keep out dirt and moistureGives your bike the factory “WORKS” look

Athena Cylinder Kit Bb 94Mm 12.3:1 Ac/Kaw/Suz P400510100002

CNC machined front sprocket cover.Designed to keep mud out of the front sprocket areaMade of A7009-T6 aluminum.

CNC machined from 6061 T-6 aluminumReplaces the stock plastic plugSealing O-ring includedLaser Engraved WC logoMade in the USA