GY6 CDI Box Replacement For 50cc To 150cc Chinese Scooters And ATVs With No Rev Limit 4 Pin And 2 Pin AC Fired CDI For 139QMB 152QMI 157QMJ Go Karts And Mopeds Plug And Play Easy Install

AC-fired GY6 CDI Box for 50-150cc Scooters & ATVs, 1x unit
✔️ 70x36x29mm (2.75x1.41x1.14in) 4+2 pin AC-fired CDI

This AC-fired CDI box replaces worn stock ignition controllers on 50cc-150cc Chinese scooters, ATVs, go-karts, and mopeds. It removes the rev limit and lets you tune ignition timing for improved response and reliability. Compatible with 139QMB, 152QMI, 157QMJ platforms.

✅ 4+2 pin round connector fits 2+4 pin harness
✅ AC-fired CDI, no rev limit for stronger acceleration
✅ Dimensions: 70x36x29mm (2.75x1.41x1.14in)
✅ Easy plug-and-play installation; swap in minutes
✅ Replaces stock unit for scooters, ATVs, go-karts, mopeds
✅ Check AC vs DC before ordering to ensure compatibility

💡 What is a CDI box used for in small engines and how does it affect ignition timing? This handy module controls spark timing and rev limit behavior, improving throttle response and reliability. - It manages ignition timing to optimize acceleration - It supports replacing worn units with AC-fired replacements - It works well on 50cc-150cc machines like scooters and mopeds