GY6 50cc (139QMB) CDI (AC)

GY6 AC CDI for 50cc and 80cc Scooters

This CDI module is built to take the place of the factory unit in GY6 and 139QMB scooters that use an alternating current (AC) system. It is intended for dependable operation on 50cc and 80cc engines. Among GY6 50cc scooter parts, it plays a central role in ignition timing and smooth running, so it suits anyone maintaining or repairing a scooter.

Build and Layout

The unit is compact and has two connectors set in a 2/4 split layout. It measures 65mm long, 37mm wide and 23mm high, not counting the plug, so it slots into the original mounting space on your scooter. Its capacitive discharge ignition design delivers a stronger, more consistent spark to aid combustion.

When to Replace

A new CDI may be worth considering if the scooter is hard to start or its engine runs unevenly. The part sits in the same spot as the old module, so swapping it is simple. It also offers a workable option when genuine OEM parts are hard to find or expensive.

Specifications

• Size: 65mm x 37mm x 23mm
• Position: Engine ignition
• AC: Alternating current
• Fits: Chinese GY6 139QMB-based 50/80cc four-stroke and GY6 157QMJ-based 125/150/169cc four-stroke scooters with

Compatibility

Compatible with:

• Chinese 139QMB-based 50/80cc four-stroke (139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, matching QMA/QMB)
• Chinese GY6 157QMJ-based 125/150/169cc four-stroke (157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A, matching QMJ/QMK/QMI)

Choosing the right part: Confirm your scooter uses an AC CDI rather than a DC unit, and check that the connector shapes, terminal positions and wiring match your original module before installing.

Browse further: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter CDI & Ignition · Scooter Parts