Retainer, HT Steel, IN/EX, Yamaha®, SR™/TT™/XT™ 500, 1976-1981

KPMI® uses tough U.S. mill certified steel bar for these retainers. Our Steel Retainers are engineered using advanced Finite Element Analysis (FEA) software. FEA stress analysis allows our engineers to lighten the retainer without sacrificing strength. KPMI® steel retainers are heat treated to a specific hardness for strength and durability. This proprietary heat treatment process creates a hard outer shell, with a non-brittle core, resisting wear and maximizing toughness. All KPMI® retainers are inspected to insure correct fitment on the valve and on the springs. Correct fitment promotes longer component life and optimizes the performance of the entire valvetrain.