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

Description

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.

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Technical Specifications

• Diameter: 16mm
• Width: 13mm
• Quantity: 6 Weights per pack
• Compatibility: For use in standard variators requiring 16x13mm rollers.

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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

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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.