Unmatched acceleration and track speed gains. Lightning-quick back shift (downshift). Holds RPM much better than factory. Secondary Smooth Shift Teflon washers included for buttery smooth secondary shifts on standard kits. Torsion spring conversion upgrade offers EVEN MORE all-around performance and may increase top speed. Much smoother and better working reverse on standard style clutch kits. Clutch kits are easily adjustable for fine-tuning. Torsion kit ONLY: Reverse on 2 stroke models may not work under high load situations (backing up a snow-covered hill), but will work fine in low load situations (off the trailer, out of the garage, etc.).. Includes setup guidelines for your specific model and different modifications we offer.