STM Powersports Tuner Secondary Clutch for 11-14 Sportsman 550/850, 2015+ 1000XP, 13-19 Scrambler 850/1000 (and others)

All billet construction capable of using compression springs with different spring rate options. We have many helix angles see menu above. We can also provide custom helix angles if you desire for an additional fee.

We also offer the option of a encapsulated helix design that keeps the driven from unloading, opening and going into high gear during breaking and jumping which some racers require.

Can be used along with the stock primary or the STM primary. Best results are acquired when running both the STM primary and STM tuner together.