Product Description
Dr. Pulley Sliding Weights (16x13) Performance CVT Tuning
Upgrade your CVT system with Dr. Pulley Sliding Roller Weights. Unlike traditional round weights, these uniquely shaped sliders allow the variator to open wider for increased top-end speed while providing a more aggressive response off the line.
Crafted from a proprietary self-lubricating nylon composite, these weights are designed for maximum longevity, high-temperature resistance, and reduced friction.
Key Performance Benefits
- Higher Top Speed: The sliding shape allows the variator to travel further than standard rollers.
- Eliminates Flat Spots: Provides a smoother, more consistent power band.
- Long-Lasting Durability: Specialized nylon material reduces wear on both the weights and the variator ramp.
- Self-Lubricating: Designed to protect your variator's inner surfaces and prevent "flat spots."
Model Fitment
This 16x13mm set is a direct fit for 50cc and 80cc 4-Stroke (139QMB) engines, as well as several popular name-brand 50cc scooters:
Major Brand Fitment:
- Genuine Scooter Co: Buddy 50, RoughHouse 50, Rattler 50, Black Duck 50
- Honda: Ruckus 50 (NPS50), Metropolitan (CHF50 - 2002-2012)
- Yamaha: C3 (XF50), Vino 50 (4-Stroke), Zuma 50F (4-Stroke)
- Kymco: Agility 50, People 50, Super 8 50 (4-Stroke)
Chinese/Import Brand Fitment (139QMB Engines):
- TaoTao: ATM50-A1, Pony 50, Thunder, VIP
- Wolf Brand Scooters: RX-50, Islander, Lucky, Blaze
- Ice Bear: Maddog (50cc), PMZ50 series
- Bintelli: Breeze, Havoc, Scorch, Sprint
- Also Fits: ZNEN, Jonway, Roketa, Peace Sports, and many more.
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", and engine displacement is between 49-80cc, this part is compatible with your vehicle.
Weight Selection Guide
Changing your slider weight significantly alters your scooter's performance:
- Lighter (3.0g - 5.5g): Best for quick acceleration and hill climbing. Runs at higher RPMs.
- Standard (6.0g - 8.5g): The "sweet spot" for daily commuting and balanced performance.
- Heavier (9.0g - 11g): Best for higher top speeds and lower RPM cruising on flat roads.
Technical Specifications
- Size: 16mm (Diameter) x 13mm (Width)
- Weight: Choose from the dropdown menu 3g to 11g
- Quantity: 6 pieces per set
- Material: High-temp, low-friction nylon composite
- Engine Codes: 139QMA, 139QMB, 1P39QMB, 1P39QMA
Note: Performance tuning parts are intended for racing and off-road use. Professional installation and belt inspection are recommended when changing weights.
