... size 3/16" keyway, 7'' OD FENJIN 20 series torque converter driven unit is a symmetrical inline small engine ... clutch that replaces Max Torque 20 Series Torque Converters, and works with 3 - 8 hp ... 4" shaft, 3/16" keyway.Specifications:3/4" 20 Series Torque Converter Driven Unit, 3/16" keyway, 7'' ODBelt ... 8HP engine. Go Kart Spare Parts Torque Converter 20 series Driven Clutch