NCY Performance AC CDI (No Rev Limiter) – GY6 & 139QMB
NCY Performance AC CDI (No Rev Limiter) – GY6 & 139QMB
$64.86
Out of stock
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Orders placed by 1pm EST on weekdays ship the same day.
Product Details
Description
NCY Performance AC CDI (No Rev Limiter) – GY6 & 139QMB is an AC ignition CDI replacement for compatible GY6 and 139QMB scooter engines.
Compatibility
Fits many 139QMB-based 50cc / 80cc scooter engines. Confirm measurements, connector style, and engine family before ordering.
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
| Weight | 0.3 lbs |
|---|---|
| Dimensions | 3 × 2 × 1 in |
| Condition | New |
|---|
Unlock your engine's full potential with the NCY Performance CDI. Designed specifically for 139QMB and GY6-based 50cc–170cc scooters, this high-output ignition module replaces your restrictive factory CDI with a more aggressive ignition curve and, most importantly, removes the factory rev limiter — allowing your engine to reach higher RPMs and sustain power through the top of the rev range.
Housed in a rugged orange billet aluminum casing, the housing doubles as a heat sink to protect the internal transformer, which boosts system voltage to 400–600 volts for a hotter spark and more efficient combustion.
Key Performance Benefits
- Rev Limiter Removed: Eliminates the electronic RPM ceiling found on stock units
- Aggressive Timing Map: Retuned ignition curve for improved acceleration and throttle response
- High-Voltage Output: 400–600V transformer boosts spark intensity for reliable ignition
- Billet Aluminum Housing: Protects sensitive electronics from road vibration and heat
- Connector: 6-Pin (Square 2-pin + 4-pin block)
- Ignition Type: AC (Alternating Current)
- Voltage Output: 400–600V
- Manufacturer: NCY (ISO 9001 Certified)
- Weight: 0.29 lbs
About NCY
NCY is a Taiwan-based ISO 9001 certified manufacturer specializing in high-performance scooter components. Their CDI units are trusted by enthusiasts and tuners worldwide for consistent quality and measurable performance gains.
Safety & Legal: This product is intended for off-road/racing use only. Not legal for use on public roads. California residents: not legal for use on pollution-controlled vehicles. Performance upgrades are considered racing parts and are not covered under warranty.
This is a 6-Pin (2+4) AC Ignition module compatible with most Chinese-manufactured GY6 engines:
| Engine Family | Compatible Codes |
|---|---|
| 50cc / 80cc (139QMB) | 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2 |
| 125cc / 150cc / 170cc (157QMJ) | 157QMJ, 161QMK, 152QMI, 1P61QMK, 1P57QMJ, 1P52FMI |
Don't see your engine listed? If the engine code includes "QM" or "FM" and uses an AC-based CDI system, this module is compatible.
Does NOT fit: Genuine 50cc scooters (Buddy/RoughHouse) or vehicles with DC-based ignition systems (e.g., Wolf Jet II).
