MOREV 5-Pin AC CDI Ignition Module for 50cc–125cc ATVs Dirt Bikes — Horizontal 4-Stroke Compatible

This compact replacement module supplies the timing pulse and spark control for engines that use a five-pin AC CDI architecture. It’s built to match the connector shape and wiring arrangement used by many small-displacement horizontal 4-stroke powertrains, providing a straightforward swap when the original CDI has failed or is unreliable. The unit does not work with DC CDI systems, six-pin GY6 connectors, or other pin arrangements, so confirming compatibility before purchase is essential.

How do I know this CDI will fit my vehicle?

Fit depends on connector type, pin layout and physical module dimensions rather than brand or displacement alone. Compare the original part’s five-pin rectangular connector, terminal positions and wiring colours to ensure a match. If those match, measure the module and review mounting points to verify fitment in the available space.

• Check your existing CDI has a 5-pin rectangular male connector.
• Compare terminal positions and wire colours to the replacement harness.
• Measure the module housing and mounting points for clearance.
• Confirm your engine uses an AC-fired ignition system, not DC.

What engines and models is this CDI compatible with?

This module is designed for select horizontal 4-stroke engines in the 50cc–125cc range that use an AC ignition setup and a matching five-pin connector. It’s commonly used across several popular Chinese-brand bikes, ATVs and go-karts, but compatibility varies by model year and harness revisions. Always cross-check the connector and wiring before ordering.

• Common compatible models: Coolster 3125B/3125R/3125XR8/3050C.
• TaoTao lineup includes: Boulder B1, Cheetah, TForce, New TForce, DB17, DB14.
• Also used on SSR SR70, SR110, SR125; Apollo RFZ/X18/X4/X19.
• May fit select Kayo, Baja, Roketa, Kazuma, SunL and Jetmoto models.

What should I expect during installation and troubleshooting?

Installation is typically a straightforward connector swap when the replacement connector and mounting fit your vehicle’s harness and bracket. If the engine still won’t fire, double-check pickup coil outputs, stator wiring and ground connections; CDIs rely on correct input signals and a solid ground. Use a multimeter and wiring diagram to isolate faults before replacing the module again.

• Disconnect battery/spark plug and follow safety procedures before swapping CDI.
• Ensure clean, corrosion-free connectors and secure mounting for vibration resistance.
• Verify pickup coil and stator signals if engine does not restart after replacement.
• Replace only when connector type, wiring layout and dimensions match original.

Who is this for: The MOREV 5-Pin AC CDI Ignition Module is for DIY mechanics, small-vehicle repair shops and owners of 50cc–125cc horizontal 4-stroke ATVs, dirt bikes, pit bikes and go-karts who need a like-for-like AC CDI replacement. It’s ideal if your vehicle’s original part uses a five-pin AC connector and you’re comfortable verifying wiring, measuring the module and performing basic electrical troubleshooting. Not suitable for DC ignition systems or vehicles that use a different pin count or connector type.