Comet 20 Series Symmetric Style Driver Clutch - 3/4in. Bore 219559A Replaces the TC-88 series, uses 3/4in W belt for increased torque capacity Symmetric-type system for mini-bikes, karts, etc. Uses standard 26 degree 3/4in wide belts For 3 to 8 hp 2-cycle or 4-cycle engines Driver Ctutch 4-cycle