RDLN Racing Performance Variator Kit with Roller Weight Tuning Set

Fits 50cc, 80cc 139QMA & 139QMB GY6 Engines

Unlock faster acceleration, smoother CVT operation, and improved top-end performance with the RDLN Racing Performance Variator Kit. Designed as a direct replacement for the factory variator, this complete performance kit includes three sets of precision roller weights, allowing you to fine-tune your scooter's power delivery for your riding style and engine modifications.

Whether your goal is quicker launches, stronger mid-range power, or higher cruising speeds, this tuning kit provides the flexibility needed to dial in your CVT transmission.

Performance Benefits

• Performance ramp plate increases belt travel for improved power delivery
• Quicker throttle response and stronger acceleration
• Improved belt efficiency for smoother CVT operation
• Potential increase in top speed (depending on engine setup)
• Includes three complete roller weight sets for custom tuning
• Precision-machined variator components
• High-quality wear-resistant roller weights with copper cores
• Direct OEM-style replacement
• Excellent upgrade for stock or big bore GY6 engines

Specifications

Variator

• Outer Diameter: 89mm
• Inner Diameter: 20mm

Drive Boss

• Outer Diameter: 20mm
• Inner Diameter: 14mm
• Length: 38mm

Roller Weights

• Roller Size: 16 x 13mm

Included:

• 6 × 6 Gram Rollers
• 6 × 7 Gram Rollers
• 6 × 8 Gram Rollers

Total Roller Weights Included:

• 18 Precision Roller Weights

Roller Weight Tuning Guide

This kit allows you to customize CVT performance without purchasing additional rollers.

6 Gram Rollers

• Highest RPM
• Fastest acceleration
• Best for modified engines and hill climbing

7 Gram Rollers

• Balanced acceleration and top speed
• Excellent all-around performance

8 Gram Rollers

• Lower cruising RPM
• Improved top speed potential
• Better for long-distance riding

Mix Roller Weights

Rollers may be alternated to create intermediate weights.

Example:

• Alternate three 7g and three 8g rollers to create an effective 7.5g setup.

Always install mixed rollers in an alternating pattern.

IMPORTANT INSTALLATION NOTICE

WARNING

Roller weights MUST be installed in a 120-degree alternating pattern.

Improper installation can cause:

• Severe vibration
• CVT failure
• Variator damage
• Possible engine damage

Always verify correct roller placement before operating the vehicle.

Compatibility

Fits most 50cc and Big Bore 80cc GY6 scooters equipped with:

• 139QMA
• 139QMB
• 1P39QMB
• 1P39QMA-2
• YN139QMB
• JJ1P39QMB
• 139FMA-2
• BD1P39QMB
• BN139QMB
• 147QMD
• Most other QMA and QMB engine variants

Also fits many engines whose code includes:

• QM
• FM

Compatible with many scooters from:

• TaoTao
• IceBear
• Wolf
• Roketa
• Jonway
• Tank
• BMS
• Peace Sports
• Vitacci
• SUNL
• JMStar
• Lance
• NST
• Dongfang
• Znen
• Many other Chinese-built GY6 scooters

Package Includes

• 1 × RDLN Racing Performance Variator
• 1 × Performance Ramp Plate
• 1 × Drive Boss
• 1 × Variator Assembly Hardware
• 6 × 6g Roller Weights
• 6 × 7g Roller Weights
• 6 × 8g Roller Weights

About RDLN

RDLN is a premium manufacturer of high-performance aftermarket scooter components engineered to improve power, reliability, and overall ride quality. Every product is field-tested to provide an ideal balance of performance, durability, and value, making RDLN a trusted choice for both daily riders and performance enthusiasts.