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The clutch is fully tunable with optional springs and weights. The optional springs and weights allow the racer to make small adjustments to the engaging speed for optimal performance. The shoes have been designed to reduce chatter and provide smooth engagement. The cleaning grooves maintain a smooth drum surface with less galling. The quick change springs, tuning weights, and new shoe design (with increased surface area) make the Flame clutch a great choice for the clone, LO206 and World Formula classes 400# or less. It is recommended to add the optional weights for super heavy classes.