RDLN Racing Variator w/ Roller Tuning Kit | Ruckus 139QMB

Unlock the full performance potential of your 139QMB GY6 50cc scooter with the RDLN Racing Variator and Roller Tuning Kit. This complete drive pulley variator assembly includes three full sets of roller weights (6g, 7g, and 8g) so you can dial in the exact balance of acceleration and top speed for your engine setup and riding style.

Key Features

• Modified ramp plate — increases maximum power output over the stock variator
• Copper core roller weights — longer lasting than standard weights
• Wear-resistant nylon construction — durable under sustained CVT load
• Three roller weight sets included — 6g, 7g, and 8g (6 rollers per set) for full tuning flexibility

Specifications

• Variator OD: 89mm
• Variator ID: 20mm
• Drive Boss OD: 20mm
• Drive Boss ID: 14mm
• Drive Boss Length: 38mm
• Roller Weight Size: 16×13mm
• Roller Sets: 6g ×6, 7g ×6, 8g ×6

Roller Weight Tuning Guide

• Lighter weights (6g) — higher RPM for a given road speed; better off-the-line acceleration
• Heavier weights (8g) — lower RPM for a given road speed; higher top speed
• Mix and match — alternate different weights to achieve intermediate values (e.g., 3×7g + 3×8g = effective 7.5g set)
• Tailor your tuning to match your engine setup and personal riding style

Safety Warning: If using different weights to achieve a half size, the roller weights must be installed in a 120-degree pattern. Incorrect installation will cause severe engine damage.

Compatibility

Fits Honda Ruckus 50, Honda Metropolitan 50, and all

139QMB-based 50cc/80cc engines:

Don't see your engine code? If it is a 49-80cc 4 Stroke engine and contains "QM" or "FM", this variator is compatible with your vehicle.

Performance upgrades are considered racing parts and are not covered by warranty. This product is intended for off-road use only and is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.

California Prop 65 Warning: www.p65warnings.ca.gov

• Modified ramp plate for increased maximum power output
• Copper core roller weights for durability
• Wear-resistant nylon construction
• Three roller weight sets for tuning (6g, 7g, 8g)
• Complete drive pulley variator assembly included

Variator OD: 89mm | Variator ID: 20mm | Drive Boss OD: 20mm | Drive Boss ID: 14mm | Drive Boss Length: 38mm | Roller Size: 16x13mm | Roller Sets: 6g x6, 7g x6, 8g x6

Honda Ruckus 50, Honda Metropolitan 50. Fits all 139QMB-based 50cc/80cc GY6 engines: 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, and any engine code containing QM or FM.