Polini 1500 RPM Compression Torque Spring | 139QMB Dio et4 150 where a straight valve won't

where a straight valve won't clear the rim halves

more comfortable ride

Thunderbike Eton Beamer

Honda Metropolitan 50 (CHF50

this simple plug-and-play module is the most effective first step in performance tuning

Polini 1500 RPM Compression Torque Spring | 139QMB Dio et4 150 where a straight valve won'tThe 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. Key Features