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:

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 (4.0g - 5.5g): Best for quick acceleration and hill climbing. Runs at higher RPMs.
• Standard (6.0g - 7.5g): The "sweet spot" for daily commuting and balanced performance.
• Heavier (8.0g - 9.5g): Best for higher top speeds and lower RPM cruising on flat roads.

Technical Specifications

• Size: 16mm (Diameter) x 13mm (Width)
• 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.

Made in Taiwan

Original Parts For Scooters SKU 169-217-4g