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this assembly allows your engine to snap through its powerband with lightning-fast acceleration
Complete OEM piston assembly for 139QMB
Make Model Yamaha Zuma 50 (YW50)
(Buddy 125/150)
GY6 157QMJ Engine Codes 157QMJ JJ157QMJ 1P57QMJ BN157QMJ Other QMJ models
Polini 1500 RPM Compression Torque Spring | 139QMB Dio muffler this assembly allows your engineThe 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
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