The Polini Compression Torque Spring (contra spring) at 1500 RPM is a direct-fit performance upgrade for Honda Ruckus, Honda Dio, Genuine Buddy/Roughhouse, and a wide range of 139QMB-based 50cc and 80cc scooters. A stiffer contra spring raises the RPM at which your CVT begins upshifting, keeping the engine in its powerband longer for stronger acceleration and improved top-end performance. Made in Italy by Polini to exacting tolerances.
Honda / Genuine platform:
139QMB-based 50cc / 80cc engines with the following engine codes:
If your engine code includes "QM" or "FM", this spring is likely compatible with your vehicle.
California Prop 65 Warning: www.p65warnings.ca.gov
