NCY Performance AC CDI (No Rev Limiter) – GY6 & 139QMB
NCY Performance AC CDI (No Rev Limiter) – GY6 & 139QMB
$26.89
Out of stock
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Product Details
Compatibility
Fits many 139QMB-based 50cc / 80cc scooter engines. Confirm measurements, connector style, and engine family before ordering.
Description
NCY Performance AC CDI (No Rev Limiter) – GY6 & 139QMB is a replacement scooter part available from ScootsUSA. This product is intended for repair, maintenance, or restoration work. Before ordering, compare the product name, SKU, dimensions, connector style, mounting points, and fitment notes with the part currently on your scooter.
Replacement Part Details
Use this part when the original component is worn, damaged, missing, or no longer working correctly. Many scooter parts can look similar but use different sizes, plugs, brackets, thread patterns, or mounting styles, so careful comparison before purchase is recommended.
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 50cc, 80cc, GY6
- Engine Code: 139QMB
- Fitment Notes: Performance
Fitment Guide: This compatibility information is based on manufacturer and supplier data. Listed models are common known applications and may not include every compatible scooter. If your scooter has multiple versions or production changes, confirm the correct match before ordering. Check photos, measurements, original part numbers, engine code, model, and related fitment information whenever possible.
Common Fitment Questions
Q: Will this fit a 139QMB engine?
A: This SKU is listed as compatible with 139QMB engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Is this for 50cc scooters?
A: This SKU is listed with 50cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
Eliminate the factory rev limiter and let your engine reach its full potential with the Universal Parts GY6 Performance Racing CDI. 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.
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.
Fitment Guide
- 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
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
Pro Tip: Pair with an NGK Iridium spark plug and a high-output ignition coil to handle the increased spark demand at high RPMs.
