Hilliard Extreme Duty 1" Bore 40/41/420 14 Tooth

This clutch has a 1" straight bore and can be run inboard or outboard configurations

Extreme duty, designed to take the heat! Thermodynamically designed clutch shoe increases the clutch's capacity to absorb heat without damaging the clutch springs, thereby providing a longer service life, even in the most demanding applications. -Bi-directional operation -Load-free starting -Overload protection -Easy to install -Integral key design -Replaceable sprocket -Easy-to-change springs -Tolerates excessive heat generated by: inexperienced riders, riding with one foot on brake, riding in soft dirt and tall grass, and frequent starts and stops

Any 1" bore clutch is very sensitive to gearing. You must have a 6:1 gear ratio with tires less than 14" in height for any clutch to survive.