Three precision torque springs engineered for Minarelli, CPI, and compatible Chinese scooter engines.

This tuning set delivers progressive spring strengths to optimize clutch engagement and eliminate V-belt slip on modified powerplants.

Each spring is calibrated to a specific RPM threshold :

• White (+1000 rpm)
• Black (+1500 rpm),
• Blue (+2000 rpm). 

Test each to find the ideal balance for your engine's performance curve. The stronger the spring, the later the clutch engages — critical for tuned engines where stock springs allow belt slippage and power loss. Mount behind the clutch on the torque drive. Essential for any serious engine modification.