Quick view OMB Warehouse Hilliard Extreme Duty Clutch #40/41/420 10 Tooth 3/4" Bore Hilliard's Extreme Duty - 3/4" 10 Tooth 40/41/420 Chain Hilliard's patent-pending Extreme Duty centrifugal clutch can handle higher temperatures to offer longer clutch life. Stock engagement at 2300... $53.99 Add to Cart