{"product_id":"ncy-performance-ac-cdi-no-rev-limiter-gy6-139qmb","title":"NCY Performance AC CDI (No Rev Limiter) - GY6 \u0026 139QMB","description":"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 Compatibility 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). Specifications 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 \u0026amp; 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. California Prop 65 Warning: www.p65warnings.ca.gov","brand":"ncy","offers":[{"title":"Default Title","offer_id":48045239566523,"sku":"0900-1005","price":65.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/1340\/6651\/files\/0900-1005_57166d4a-f27e-4502-9505-740d7c790994.jpg?v=1783055002","url":"https:\/\/thriftyscooters.com\/products\/ncy-performance-ac-cdi-no-rev-limiter-gy6-139qmb","provider":"Thrifty Scooters","version":"1.0","type":"link"}