STM Secondary Clutch - Ski-Doo 900 Ace Turbo / Turbo R / Mach Z

All new driven secondary . Complete billet redesign utilizing our custom helix with a three roller configuration. Offering a compression or torsion spring design with different spring rates to choose from. This secondary clutch is the only torsion style driven available that works with the reversing two stroke engines for backing up .The new helix catch design aids in downhill engine braking holding the two driven sheaves together while descending . A tighter tolerance and lighter design that provides a smoother more aggressive shift than the stock driven. All parts are replaceable