Brand new go kart mini bike Centrifugal clutch 10 tooth, 5/8″ bore, #40/41/420 chain with 3/16 key built in. Bore Size: 5/8 inch,Horse Power: Up to 6.5 HP,# of Teeth: 10T, Chain Size : #40/41/420 Fits for mini bike , go kart, mini atv and so on Mounts onto crankshaft using bolt and washer on the end of the crankshaft does not have set screws. Engagement Speed: 2000??100 RPM; Please double check your crankshaft size before you purchase. It is a replacement that used on all versions of the Baja Mini Bike (MB165 MB200), including the Baja Heat, Mini Baja, and the Baja Warrior. Baja Part Number: 165-046 6. This item is also a perfect replacement part on many small utilities, 163cc 5.5 Hp, and 196cc 6.5 Hp engines. Replacemetn Compatible with 2 – 6.5hp Honda Honda Cloned Engines GC160, GC190, GX120, GX140, GX160, GX200 Replacement for Briggs and Stratton and 2-6.5 HP With 5/8″ Shaft Tecumseh Engines 2-6.5 HP With 5/8″ Shaft Specifications: Clutch Bore: 5/8″ Spr