(for Briggs & Stratton LO206 Racing Engine)
The Hilliard / Bully clutch uses the very popular Bully or aftermarket Bully sprockets.
It is an especially good idea if you already have an assortment of Bully sprockets. If you need large clutch sprockets for road racing it is an excellent choice. It can be purchased with 12 to 21 tooth #35 sprockets or 13 to 25 tooth 219 sprockets.
It is easy to set up, adjust, change sprockets or engagement rpms. It is consistent, inexpensive yet durable. It works great if you mount it either inboard or outboard.