Dr. Pulley 20x12 Sliding Roller Weights: Yamaha, Kymco

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. About Dr. Pulley Dr. Pulley is a Taiwanese performance CVT specialist with decades of experience engineering variator components for scooters and small-displacement motorcycles. Their patented sliding weight technology is widely regarded as the benchmark CVT upgrade, trusted by tuners and everyday riders worldwide for consistent, measurable performance gains. California Prop 65 Warning: www.P65Warnings.ca.gov