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

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

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

$25.99
$25.99
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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.
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Fitment FAQ

Will this part fit my specific model and year?

This clutch assembly is intended for Vehicle Type; Engine Type; Common Brands; Chinese Scooters; GY6 50cc, 60cc, 80cc, 90cc; TaoTao, Peace, Wolf, Ice Bear, Bintelli; Mopeds. Key physical/spec details from the product data include Outer Diameter (Drive Face): 89mm (3.5"), 50cc, 90cc. Use the compatibility table and product photos together before ordering.

Do I need to match the OEM part number?

Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this clutch assembly, also compare the spline count, clutch bell diameter, pulley diameter, spring style, belt width, and engine platform. This is especially important for GY6/TaoTao GY6 models because similar model names can use different parts by year or trim.

What models or situations does this part not fit?

Do not order this clutch assembly for machines outside the listed compatibility, or for units with different spline counts, clutch-bell sizes, pulley diameters, or engine platforms. Do not rely only on the model name or engine size.

What should I check before ordering?

Before ordering, compare your original part with the photos and check the spline count, clutch bell diameter, pulley diameter, spring style, belt width, and engine platform. Recheck listed specs such as Outer Diameter (Drive Face): 89mm (3.5"), 50cc, 90cc. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.