SPROCKET CENTRIFUGAL CLUTCH HILLIARD EXTREME DUTY model LD4S-13 sprocket centrifugal clutch with bronze bushing. Ideal for yard-karts, youth snowmobiles and other applications. Not intended for racing. Thermodynamically designed clutch shoe increases the clutch''s capacity to absorb heat without damaging clutch springs, resulting in longer life and greater reliability. Easy to install. Overload protection. Load- free starting. Made in USA.