Shaft size: 3/4inch BoreChain Size: #35 Chain ( 4 Feet )Tooth Count: 12 ToothClutch Diameter: 107 mmClutch Height: 55 mmEngagement Speed: 2300 +/- 300 RPMRecommended Engine: 2HP - 6.5HP, 3/4inch shaft with flat keyFitment:2-6.5hp & cloned engines GC160, GC190, GX120, GX140, GX160, GX200Perfect for Go Kart, Mini bike, Fun KartCommon clutch for 3.5-7hp engines using #35 Chain and 2 - 6.5 with 3/4inch Shaft Engines 2 - 7 with 3/4inch ShaftOther engines with 3/4 crank shaft and 3/16inch key wayMost 5.5 clones, 6.5 clones and 4-7HP motors in all Colour: blackMaterial: steelPackage Contents:1 * Centrifugal Clutch1 * ChainOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.