After installing a high-performance cylinder kit, the drive belt may start to slip, and the rear drive assembly may have trouble handling the increased torque/power from the front drive assembly with the CVT. In these cases, it may be worth increasing the tension of the counterpressure spring.
White spring = +30%
Yellow spring = +35%
Red spring = +40%
NOTE! Fits pulleys with Minarelli/CPI "standard" compression spring size, approx. 53 mm Ø. NOTE!