Twilight Garage Centrifugal Clutch, Go Kart Clutch 10 Tooth, 5/8" Bore for for #40/41/420 Chain Sprocket for Go-Karts Mini Bike Lawnmower Engine 6.5HP. - 10T 5/8" BORE CLUTCH. Centrifugal clutch 10 tooth, 5/8" bore, For #40/41/420 chain (Chain Not included), with 3/16 key built in.
eBay