Prima 16x13mm CVT Roller Weights - 139QMB, Ruckus, Buddy 50

Prima Roller Weight Set (16x13mm) – Precision CVT Tuning Fine-tune your scooter's performance with the Prima 16x13mm Roller Weight Set . Whether you are looking for quicker off-the-line acceleration or a higher top-end speed, changing your roller weights is the most cost-effective way to customize your ride's power delivery. Prima weights are manufactured to exacting tolerances to ensure smooth shifting and long-term durability in high-heat CVT environments. CVT Tuning Guide Choosing the right weight depends on your riding goals and body weight: Lighter Weights (3g - 5g): Ideal for quick "stop-and-go" acceleration, better hill climbing, and heavier riders. Note: May slightly decrease top-end speed. Mid-Range Weights (6g - 8g): Best for balanced daily commuting. These are typically close to the "stock" feel for most 50cc scooters. Heavier Weights (9g - 11g): Best for increasing top-end speed on long flat roads and for lighter riders. Note: Acceleration will be more gradual. Technical Specifications Diameter: 16mm Width: 13mm Quantity: 6 Weights per pack Compatibility: For use in standard variators requiring 16x13mm rollers. Detailed Model Fitment This 16x13mm set is a direct replacement for 49cc - 80cc 4-Stroke (139QMB / GY6 50) engines, as well as premium 50cc models from Genuine, Honda, and Yamaha. Genuine Scooter Co. (2-Stroke): Buddy 50 / International: (Stock: 7.5g - 8.5g) RoughHouse 50 / Sport / 50 Titanium: (Stock: 7.5g - 8.5g) Rattler 50: (Stock: 11.5g) Black Cat 50: (Stock: 7.5g - 8.5g) Honda & Yamaha (4-Stroke GET/Liquid Cooled): Honda Ruckus (NPS50): All Years Honda Metropolitan (CHF50): 2002–2012 Yamaha C3 (XF50): 2007–2011 Yamaha Vino 50: 4-Stroke Models Yamaha Zuma 50F / 50FX: 4-Stroke Models (2012+) Chinese & Taiwanese 50cc (GY6 50 / 139QMB): Chicago Scooter Co: Go. 50, Go. Max 50 Wolf Brand Scooters: RX-50, Islander, Lucky, Blaze, MOTO TaoTao / Tao Motors: ATM50-A1, Pony, VIP, Thunder Lance / SYM: Cali Classic 50, PCH 50, Cabo 50 Kymco: Agility 50, Super 8 50 (4-Stroke) Bintelli / Ice Bear: Breeze, Havoc, Maddog 50, PMZ50 Engine Code Compatibility Don't see your model listed? If your engine tag contains any of the following codes, these 16x13mm weights are compatible 139QMB-based 50cc / 80cc engines with the following engine codes: 139QMA 139QMB 1P39QMB 1P39QMA-2 YN139QMB JJ1P39QMB 139FMA-2 BD1P39QMB BN139QMB 147QMD Other QMA models Other QMB models Don't see your engine listed? If the engine code includes "QM" or "FM", this product is compatible with your vehicle.