The excessive heat generated in your 4 stroke engine will break down stock chrome silicon clutch springs. As the clutch springs fade they loose their clamping power causing your clutch plates to slip and your horsepower to diminish. Tokyomods clutch springs are manufactured from the highest quality material to resist to high temperatures caused by today’s 4 stroke engines. Tokyomods clutch springs will increase your clutch engagement without a heavy lever feel. These are a must for all 4 stroke motocross bikes.