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

Eliminate the factory rev limiter and let your engine reach its full potential with the Universal Parts GY6 Performance Racing CDI (169-27). Designed specifically for AC-fired GY6 50cc, 125cc, and 150cc engines, this unit removes the electronic RPM ceiling and features a re-mapped ignition advance curve for sharper throttle response, improved acceleration, and a potential top-speed increase of 5–10 MPH on most stock and modified machines.

Housed in a gold anodized aluminum finned heat-sink case labeled "New Racing C.D.I" with a printed advance curve chart. Connects via the standard 6-pin (4+2) green rounded male plug — plug-and-play on most Chinese-style GY6 wiring harnesses.

Important: This CDI is compatible with AC-fired electrical systems only. Verify your system type before ordering — if your scooter has a battery-dependent ignition (DC), this unit will not work.

This product is intended for off-road use only. This product is not intended for use on public roads or land.

Key Features

• Unrestricted Rev Limit: Removes the factory RPM ceiling — essential for big-bore and high-cam builds.
• Optimized Advance Curve: Re-mapped ignition timing for a hotter, more precise spark at higher RPMs and maximum combustion efficiency.
• Gold Anodized Aluminum Housing: Finned heat-sink case dissipates heat and withstands vibration and thermal stress of high-performance riding.
• Plug-and-Play: Standard 6-pin (4+2) green rounded male connectors for tool-free installation on most GY6 Chinese wiring harnesses.

Technical Specifications

• Firing System: AC (Alternating Current)
• Plug Style: 6-pin (4+2 rounded male connectors)
• Case: Gold anodized aluminum finned heat-sink
• Performance Gain: Approx. 5–10 MPH top speed increase
• SKU: 169-27

Compatibility

• GY6 50cc (QMB139): TaoTao, Wolf, Icebear, Peace Sports, Bintelli, and other Chinese 50cc scooters
• GY6 125cc / 150cc (QMJ157): Long-case and short-case 150cc street scooters
• Off-Road / Utility: 150cc–170cc go-karts, dune buggies, and ATVs with AC ignition

• 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.