Bore Size: 3/4 inch Horse Power: Up to 6.5 HP # of Teeth: 10T Chain Size : #40/41/420 Engagement Speed: 2000??100 RPM; No Set Screw Holes. Two Set Screws are NOT included! Jeremywell Brand Centrifugal Clutch 3/4″ 10 Tooth Perfect For Go Kart Minibike Baja Mini Bike MB165 MB200 (Chain Size: #40/41/420) Set Screws and Chain Not Included 1. Centrifugal Clutch 10 tooth, 3/4″ bore with 3/16 key built in. 2. Common clutch for 3.5-7hp engines. 3. Mounts onto crankshaft using bolt and washer on the end of the crankshaft. 4. This clutch assembly with 3/4” shaft for 163cc 5.5 HP 196cc 6.5 HP Engines, which is the replacement Clutch Assembly. 5. It is used on all version 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 utility 163cc 5.5 Hp and 196cc 6.5 Hp engines.