Prime Line 7-06003 Centrifugal Clutch for Mini-Bikes, Go-Karts, Riding Mowers, Snow Throwers and Garden Tractors Automatic Centrifugal Clutch Sintered Metal For Smoother Action Limited Slip Engages at 1800-2200 RPM 10 Tooth Single Sprocket with 3/4" Shaft For Use with No.41 Chain