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
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Higher Top Speed: The sliding shape allows the variator to travel further than standard rollers.
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Eliminates Flat Spots: Provides a smoother, more consistent power band.
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Long-Lasting Durability: Specialized nylon material reduces wear on both the weights and the variator ramp.
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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:
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Genuine Scooter Co: Buddy 50, RoughHouse 50, Rattler 50, Black Duck 50
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Honda: Ruckus 50 (NPS50), Metropolitan (CHF50 - 2002-2012)
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Yamaha: C3 (XF50), Vino 50 (4-Stroke), Zuma 50F (4-Stroke)
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Kymco: Agility 50, People 50, Super 8 50 (4-Stroke)
Chinese/Import Brand Fitment (139QMB Engines):
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TaoTao: ATM50-A1, Pony 50, Thunder, VIP
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Wolf Brand Scooters: RX-50, Islander, Lucky, Blaze
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Ice Bear: Maddog (50cc), PMZ50 series
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Bintelli: Breeze, Havoc, Scorch, Sprint
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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:
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Lighter (4.0g - 5.5g): Best for quick acceleration and hill climbing. Runs at higher RPMs.
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Standard (6.0g - 7.5g): The "sweet spot" for daily commuting and balanced performance.
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Heavier (8.0g - 9.5g): Best for higher top speeds and lower RPM cruising on flat roads.
Technical Specifications
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Size: 16mm (Diameter) x 13mm (Width)
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Quantity: 6 pieces per set
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Material: High-temp, low-friction nylon composite
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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.
Made in Taiwan
Original Parts For Scooters SKU 169-217-4g
