NCY Performance AC CDI (No Rev Limiter) - GY6 & 139QMB

Unlock your engine's full potential with the NCY Performance CDI. Designed specifically for 139QMB and GY6-based 50cc and 150cc scooters, this high-output ignition module replaces your restrictive factory CDI to provide a more aggressive ignition curve and, most importantly, removes the factory rev limiter. This allows your engine to reach higher RPMs and maintain power through the top end of the gear range.

Housed in a rugged orange billet aluminum casing, this CDI isn't just for looks—the housing acts as a heat sink to protect the internal transformer, which boosts system voltage up to 400–600 volts for a significantly hotter spark and more efficient combustion.

Key Performance Benefits:

• Unrestricted Power: Eliminates the electronic RPM "ceiling" found on stock units.
• Aggressive Mapping: Retuned timing curve for improved acceleration and throttle response.
• High-Voltage Output: Internal transformer boosts spark intensity for more reliable ignition.
• Billet Protection: Durable aluminum housing protects sensitive electronics from road vibration and heat.

Detailed Compatibility:

This is a 6-Pin (2+4) AC Ignition module. It is compatible with most Chinese-manufactured GY6 engines, including:

• 50cc / 80cc (139QMB Series): Fits 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, and 139FMA-2.
• 125cc / 150cc / 170cc (157QMJ Series): Fits 157QMJ, 161QMK, 152QMI, 1P61QMK, 1P57QMJ, and 1P52FMI.

Don't see your engine listed? If the engine code includes "QM" or "FM" and you have confirmed that it has an AC-based CDI system, this product is compatible with your vehicle.

Note: Does NOT fit Genuine 50cc scooters (Buddy/RoughHouse) or vehicles with DC-based ignition systems (such as the Wolf Jet II).

Technical Specifications:

• Connector Style: 6-Pin (Square 2-pin + 4-pin block)
• Ignition Type: AC (Alternating Current)
• Voltage Output: 400V - 600V
• Manufacturer: NCY (ISO 9001 Certified)

Safety & Legal:
• This product is intended for off-road/racing use only.
• Not legal for use on public roads or land.
• California Residents: Not legal for use on pollution-controlled vehicles.

*Performance upgrades are considered racing parts and are not covered by warranty.