Dr. Pulley
Dr. Pulley 20x12 Sliding Roller Weights: Yamaha, Kymco
Description
Unlock the full gear range your CVT was designed for. Dr. Pulley 20x12mm Sliding Weights replace the flat-spotting round rollers in your variator with a patented non-round geometry that lets the variator retract further for a lower starting ratio and extend further for a higher top-speed ratio — delivering faster launches and lower cruising RPMs without touching your belt or variator. Choose your gram weight to dial in exactly the performance character you want.
Performance & Engineering Advantages
- Eliminated Flat Spots: The sliding shape prevents the uneven wear and notching common with circular weights, ensuring consistent shifting performance for thousands of miles.
- Maximum Gear Range: Pushes the variator plate further than OEM specs, providing a tangible increase in top-end speed on open roads.
- PA46 Tribological Composite: Oilless, self-lubricating nylon that resists heat and friction better than standard rollers — no grease required.
- Precision Gram Tuning: Available in 8.5g through 12g (in 0.5g increments) to perfectly match your CVT engagement to your riding style or exhaust setup.
Technical Specifications
- Dimensions: 20mm (diameter) x 12mm (width)
- Material: Oilless PA46 Tribological Composite
- Shape: Patented Sliding Geometry
- Available Weights: 8.5g, 9g, 9.5g, 10g, 10.5g, 11g, 11.5g, 12g
- Quantity: Set of 6
Fitment Guide
These 20x12mm weights are a direct performance upgrade for many 125cc–300cc scooters and go-karts:
| Brand / Engine | Compatible Models |
|---|---|
| Yamaha | Zuma 125 (All Years), Vino 125, Majesty 250, Morphous 250, SMAX 155 |
| Kymco | Downtown 200/300, People GT 200/300, Xciting 250/300 |
| Linhai | 250, 260, 300 |
| Trailmaster | 300S, 300 XRX (Go-Karts) |
Tuning & Installation Tips
- Orientation is critical: Ensure the Dr. Pulley logo/flat side faces the correct direction in the variator ramps — incorrect installation will hinder performance and can cause damage.
- For better acceleration: Go 1–2 grams lighter than stock.
- For better top speed: Stay at stock weight or go 1 gram heavier.
Product Diagrams
Features
Specifications
Dimensions: 20mm diameter x 12mm width | Material: PA46 Tribological Composite | Shape: Patented Sliding | Weights: 8.5g, 9g, 9.5g, 10g, 10.5g, 11g, 11.5g, 12g | Qty: 6 per set | SKU: 1200-1117
Model Fitments
Yamaha: Zuma 125 (all years), Vino 125, Majesty 250, Morphous 250, SMAX 155; Kymco: Downtown 200/300, People GT 200/300, Xciting 250/300; Linhai: 250/260/300; Trailmaster: 300S, 300 XRX
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
