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Here's a good article by the inventor of the Heel Clicker clutch weights that I use on my 2000 XCR 800. They incorporate a two angle profile. It launches very smoothly and the engagement rpm can be tailored to suit your needs. You can feel the distinct change of rpm as the roller transitions from one profile to the other. The effects of this design were computer simulated. He explains the effects of the clutch weight COM as it swings about it's axis.

 
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