GY6 Performance Variator Kit - 18x14 Weights

Performance Variator Kit for GY6 125cc and 150cc Engines

This Performance Variator Drive Pulley Kit is built for GY6 157QMJ engines, found in 125cc and 150cc scooters, ATVs, and go-karts. It replaces the stock continuously variable transmission (CVT) components to help improve performance and efficiency. Among GY6 scooter parts, it is a option aimed at firmer acceleration and higher top speed. The outer drive face is made from anodized aluminum, and the kit includes everything needed for a complete installation.

Construction and Design

The variator uses an 8-fin outer drive face measuring 115mm in diameter, which helps the belt grip more consistently. A machined splined center hub gives a precise fit. The kit contains the variator, a ramp plate, three slide pieces, and six roller weights. Each roller weight measures 18x14mm and weighs 12 grams.

Compatibility and Belt Requirements

This variator works with 835x20x30 belts, so check your belt size before ordering. It is made for GY6 157QMJ-based engines, which means it applies to a range of vehicles. The kit has a spline count of 19, a detail that matters for correct installation and operation.

Specifications

• Drive Face Outer Diameter: 115mm
• Variator Outer Diameter: 108mm
• Number of Splines: 19
• Splined Inner Diameter (peak to peak): 13.5mm
• Splined Inner Diameter (valley to valley): 15mm
• Roller Weights: 18x14mm, 12g (set of 6)
• Engine: GY6 157QMJ 125cc / 150cc 4-stroke
• Fits: GY6 157QMJ 125cc and 150cc 4-stroke engines in scooters, ATVs and off-road go-karts

Fitment

Fits:

• GY6 157QMJ 125cc 4-stroke engine
• GY6 157QMJ 150cc 4-stroke engine
• Scooters, ATVs and off-road go-karts with those engines (most Chinese GY6-based makes)

How to choose: Before buying, confirm your belt is 835x20x30 and your existing variator has 19 splines. This kit is for 835x20x30 belts only.

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