Mophorn Torque Converter Comet Clutch Go Kart Clutch 1Inch Replaces Comet TAV2 Manco 10T 40 or 41 and 12T 35 Chain Drive Belt (1" 10T 40/41and 12T 35 Chain) Aluminum back plate 12T sprocket for #35 chain and 10T sprocket for 41/40 chain- both included. Drive clutch bore: 1"(25.4mm ) Driven unit: Diameter 6" (5/8" driven pulley) A torque converter acts similar to a transmission, allows higher speeds out of your small engine, and smoother acceleration. This clutch will help you get more power out of your small engine by reducing engine load.