Modified TAV2/30 Series: Our go-kart torque converter is the latest TAV2/30 asymmetrical series. The asymmetrical type system can reduce engine load and gain more power to bring your off-road machine back to life. Updated Durable Belt: The new type of belt, go-kart asymmetrical belt 669, is one of the highlights for our torque converter for go-karts. Using this excellent elastic belt properly can improve the life span of your torque converter. Quality Drive Clutch: We have a 3/4'' Driver Pulley and a 5/8'' bore driven pulley. They are made of aluminum and steel. And it also can fit for 4-8 hp small torque converter systems. Vehicle Fitment: The torque converter is compatible with 3/4" & 5/8" straight crankshaft. You can usually use it on 4-8 hp go-karts and motorbikes. Full Accessories: Our torque converter clutch has full accessories: 1 x 3/4" driver pulley. 1 x 5/8" bore driven pulley. 1 x plastic assy cover. 1 x aluminum mounting plate. 1 x driver belt. 1 x full mounting hardware.