Engine

WE RACE ON THE TRACK, NOT THE DYNO! Most camshaft designs are developed only on a dyno. Good camshaft designs not only increase power, they also improve throttle response. However, more power and better throttle response is a difficult design problem...

Cylinder looks just like stockNickel silicon carbide plated for longer life

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...

RAISES COMPRESSION FOR BETTER LOW END POWERGRAPHITE GASKETS FEATURE A STEEL CORE, LAMINATED ON BOTH SIDES WITH FLEXIBLE GRAPHITEFIBER GASKETS DESIGNED FOR MAXIMUM SEAL, FLEXIBILITY AND TORQUE RETENTIONO-RING GASKETS MEET OR EXCEED OEM SPECIFICATIONS

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

BBR Hd Valve Springs 411-Hcf-1504

Athena Power Valve Yam S410485303018

Athena Cylinder Kit Bb 58Mm 14.0:1 Yam P400485100030

Athena Cylinder Kit 44.5Mm 14.2:1 Kaw P400250100006

Athena Cylinder Head 44.5Mm Kaw S410250308001

Patented fork seal features a balanced 3 lip design that evenly distributes the pressure reducing operating temperature, wear and frictionCustom Elastomer Fork Seals have been tested to outlast OEM fork seals. Extends typical seal life by 3 to 5 times...

Feature Koyo and Nachi precision Japanese crank bearingsThe crankshaft seals feature a carbon/fluorocarbon pad on the seal lip and stainless steel garter springsReduces startup friction enhancing dry start performance and reducing crank pin wear