Variator & Tuning Kit for GY6 50cc 70cc 80cc 90cc (139QMB) Scooter ATV

Product Overview

Take full control of your transmission with this Modified Performance Variator Tuning Kit. Specifically designed for the GY6 50cc-90cc engine family (139QMB/139QMA), this kit is more than just a replacement—it is a comprehensive tuning solution. With nine included roller weights in three different sizes and a high-torsion clutch spring, you can customize your scooter's performance for quicker take-offs, better hill climbing, or higher top-end speeds.

Product Compatibility

Vehicle Type	Engine Type	Common Brands
Chinese Scooters	GY6 50cc, 60cc, 80cc, 90cc	TaoTao, Peace, Wolf, Ice Bear, Bintelli
Mopeds	139QMB / 1P39QMB / 139QMA	Kymco, SYM, Gator, Vitacci
ATVs / Go-Karts	50cc–90cc 4-Stroke	TaoTao Pony, Coleman, TrailMaster

Specifications

Feature	Details
Outer Diameter (Drive Face)	89mm (3.5")
Roller Weight Assortment	9pcs Total: 5g (x3), 7g (x3), 9g (x3)
Spring Type	High-Torsion Driven Pulley Spring
Engine Fitment	GY6 139QMB series (4-Stroke)
Components	Drive Face, Variator Spacer, Movable Pulley, Ramp Plate, Slides

Key Features

• Complete Tuning Assortment: Includes three different weights (5g, 7g, and 9g) allowing you to mix and match rollers to find the "sweet spot" for your specific riding weight and terrain.
• High-Torsion Clutch Spring: Comes with a heavy-duty torque spring for the driven pulley. This prevents belt slippage and keeps the engine in its power band longer during uphill climbs.
• Modified Drive Face: The 89mm performance drive face is precision-machined to provide a smoother surface and optimized angles, reducing friction and extending the life of your drive belt.
• Enhanced Acceleration: By utilizing the lighter 5g rollers or the high-torsion spring, you can significantly improve throttle response and eliminate "bogging" during initial take-off.
• All-in-One Performance Upgrade: This kit provides everything needed to overhaul the front variator and the rear torque spring, ensuring the entire CVT system is synchronized for maximum efficiency.