CG 125cc–250cc 6-Pin AC CDI Box

CG 125cc–250cc 6-Pin AC CDI Compatibility Guide

This 6-pin AC CDI ignition box is a replacement for Chinese CG-type 125cc, 150cc, 200cc and 250cc 4-stroke engines — the upright-cylinder engines used in many Chinese ATVs, dirt bikes and go karts. It controls ignition timing and fires the coil so the engine runs smoothly.

Not for GY6 engines — and CDIs are not universal. They differ by AC or DC type, plug layout and timing, so bring in your existing CDI (or ignition coil) and we will match it to the right one before you buy.

Specifications

• Type: AC CDI (powered by the stator, not the battery)
• Connectors: 6-pin with square plug housings
• Engine: CG-type 125cc, 150cc, 200cc and 250cc 4-stroke (upright cylinder)
• Size: 66 mm long x 38 mm wide (2.59″ x 1.49″)
• Not for: GY6 engines

Compatible Vehicles

• ATVs: Select Chinese 125cc–250cc ATVs with CG-type engines
• Dirt Bikes: Select Chinese 125cc–250cc dirt bikes with CG-type engines
• Go Karts: Select Chinese 125cc–250cc go karts with CG-type engines

Fitment varies by year and model, so always compare against your original CDI.

Which CDI Do I Have?

• GY6 50cc–150cc scooters & ATVs: 6 pins in two plugs — one 4-pin and one 2-pin. See the GY6 50cc–150cc AC CDI →
• CG 125cc–250cc ATVs, dirt bikes & go karts: 6 pins in square plug housings. (This page)
• Chinese 50cc–125cc ATVs, dirt bikes & pocket bikes: 5 pins in one green square plug. See the 5-Pin AC CDI →

Still not sure? Bring in your old CDI and we will match it for you.

Signs Your CDI Is Going Bad

• No spark, even with a good spark plug and coil.
• The engine cuts out once it warms up, then restarts after cooling down.
• Misfiring, backfiring or popping under throttle.
• The engine will not rev past a certain point.
• Hard starting that gets worse over time.

No spark can also come from the stator, ignition coil, kill switch or wiring. Bring your ATV, dirt bike or go kart in and our service department will find the real cause — basic diagnostics are free.

CG AC CDI FAQ

Is a 6-pin CDI the same as a 5-pin CDI?
No. The plug layouts and wiring are different, so they are not interchangeable. Count the pins on your old CDI — if it has five pins with a single green square plug, see our 5-pin AC CDI for Chinese 50cc–125cc engines.

What is the difference between an AC and a DC CDI?
An AC CDI is powered by the stator, while a DC CDI runs off the battery. They are not interchangeable — using the wrong type can keep your engine from running. Bring in your old CDI so we can confirm which one you need.

Do you have it in stock?
We keep CDIs in stock at 2916 S Santa Fe Ave, Los Angeles. Call (323) 588-6634 to confirm before you come in.

Can you replace it for me?
Yes. Our service department works on Chinese ATVs, dirt bikes and go karts every day. Call (323) 588-6634 to book an appointment.