Here is a new flyweight especially designed for the bigger displacement, higher torque motors. For all of you swapping flyweights to make your sled faster or for changing conditions, the big twins and triples now make so much power that tuners have a hard time finding flyweights able to squeeze the belt without slipping it. Here is the bottom line in clutching.
Heavier flyweights generate more centrifugal force.
If you increase the horsepower of an engine, you would normally add more weight to keep the engine pulling as hard as possible and not over and under rev. Sure, we could get into experimenting with various flyweights, grinding and filling them, or trying all different kinds of curvatures, helixes, springs and the rest, but for most performance minded tuners there is a simple and easy way to make your sled go faster, without spending a ton of time or money. The amount of mass in the heel area has been increased significantly to provide more belt squeezing force at low shift ratios, with three threaded holes allowing you to add or subtract the exact amount of weight in locations that control the low end, midrange, and top end. Forget about swapping flyweights, this one set can be adjusted to near perfection. This can be done without even removing the flyweights from the clutch.