Aftermarket replacement fits 3/4″ standard crankshaft, built-in square key and set screw. This clutch compatible with most for Mini Bikes and Go Carts equipped with 40/41/420 chain Thermodynamically designed clutch shoe increases the clutch’s capacity to absorb heat without damaging the clutch springs, ensures a longer life ad reliability. Pls use engine crankshaft diameter and chain size to choose the clutch you needed. before leaving factory to for Make sure reliability and superior performance. Please check picture and description carefully to ensure this part will fit your needs. Check before buying will help you avoid unnecessary hassle and return shipping costs. COMPATIBILITY:2-6.5hp for Honda Cloned Engines GC160,GC190,GX120,GX140,GX160,GX2002-6.5hp for Briggs StrattonBaja for Mini Bike MB165 MB200Harbor Freight Predator 212ccHarbor Freight Greyhound 196ccSpecification:Material: IronClutch: 3/4″; Bore 10 ToothCompatiable Chain Size: 40/41/42