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5-Pin AC CDI Box for Chinese 50cc–125cc ATV Pit Bike Dirt Bike
5-Pin AC CDI Box for Chinese 50cc–125cc ATV Pit Bike Dirt Bike
4.82 / 5.0
(33) 33 total reviews
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Product Overview
Restore stable ignition performance with this 5-pin AC CDI box, designed for many Chinese 50cc, 70cc, 90cc, 110cc, and 125cc horizontal engine ATVs, pit bikes, dirt bikes, mini bikes, and pocket bikes.
The CDI unit controls ignition timing and spark output, helping the engine start more reliably and run more smoothly when the original CDI is weak, damaged, or failing. It is a practical replacement for common ignition-related problems such as no spark, hard starting, intermittent shutdown, rough running, or poor throttle response.
Built with a weather-resistant housing, this CDI box is designed to handle normal vibration, dust, and moisture exposure found in off-road riding conditions. The 5-pin AC design makes it suitable for compatible Chinese horizontal engine ignition systems used on brands and models such as SSR, TaoTao, X15, X18, 3125B, 3125R, and 3125XR8.
Product Compatibility
| Vehicle / Engine Type | Engine Size | Fitment Notes |
|---|---|---|
| Chinese ATV | 50cc–125cc | Must use 5-pin AC CDI |
| Pit Bike | 50cc–125cc | For horizontal engine applications |
| Dirt Bike | 50cc–125cc | Check plug shape and pin layout |
| Mini Bike | 50cc–125cc | Compare original CDI before purchase |
| Pocket Bike | 50cc–125cc | Compatible with select AC ignition systems |
Common Compatible Models / Brands
| Brand / Model | Notes |
|---|---|
| SSR | Select 50cc–125cc horizontal engine models |
| TaoTao | Select ATV, pit bike, and dirt bike applications |
| X15 / X18 | Compatible with select Chinese pit bike setups |
| 3125B / 3125R / 3125XR8 | Fits select 125cc horizontal engine models |
| Chinese Horizontal Engine Vehicles | 50cc, 70cc, 90cc, 110cc, 125cc AC ignition systems |
Specifications
| Specification | Details |
|---|---|
| Product Type | CDI Box / Ignition Control Unit |
| CDI Type | AC CDI |
| Pin Count | 5 Pin |
| Engine Compatibility | 50cc, 70cc, 90cc, 110cc, 125cc |
| Engine Style | Horizontal Engine |
| Vehicle Applications | ATV, Pit Bike, Dirt Bike, Mini Bike, Pocket Bike |
| Housing | Weather-Resistant Protective Housing |
| Protection | Dust, Moisture & Vibration Resistant |
| Installation Type | Direct Replacement, fitment confirmation required |
| Condition | Brand New |
Key Features
5-Pin AC CDI Replacement
Designed for compatible Chinese horizontal engine ignition systems using a 5-pin AC CDI configuration.
Fits 50cc–125cc Horizontal Engines
Works with many 50cc, 70cc, 90cc, 110cc, and 125cc Chinese ATVs, pit bikes, dirt bikes, mini bikes, and pocket bikes.
Supports Stable Ignition Output
Helps control ignition timing and spark signal for smoother starting, more stable running, and improved throttle response.
Weather-Resistant Housing
Made with protective materials to help resist dust, moisture, and vibration during normal off-road and recreational riding.
Practical Fix for Ignition Problems
A useful replacement part when diagnosing no-spark issues, hard starting, rough idle, intermittent stalling, or weak ignition performance.
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Perfect fit! Old CDI Box would kill four wheeler when hitting bumps. Checked for electrical shorts but there was was none. Dialed it to the 5 pin CDI box. Replaced CDI box four wheeler stopped dieing randomly over bumps.
Bought these for my go kart and dirt bikes works ok
Worked great on my SSR 125
Great price, works just like it should. Plug and play
The ATV is repaired.
- 5 stars: 27 (82%)
- 4 stars: 6 (18%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 star: 0 (0%)
Perfect fit! Old CDI Box would kill four wheeler when hitting bumps. Checked for electrical shorts but there was was none. Dialed it to the 5 pin CDI box. Replaced CDI box four wheeler stopped dieing randomly over bumps.
Bought these for my go kart and dirt bikes works ok
Worked great on my SSR 125
Great price, works just like it should. Plug and play
The ATV is repaired.
Installed on my son's Coolster 3125-XR8 ATV after the stock CDI box failed. I now keep a couple of spares on hand since these are cheap, easy to replace and clearly prone to failure.
Wrong connectors so it may just be a mistake on my end. Make work for yours.
Good quality
Perfect to replace the factory cdi and adds 5 to 10 moh depending on weight of rider
Great product
I replaced the CDI in my buddy 50cc and it is working fine.
As described
Simple to replace price is right nothing else you can say about this product
Works perfect on my 70cc Baja dirt bike very happy
Good
Works perfectly
Fast delivery. Works like the original. I am totally satisfied.
Works fine. Had to return the first one lasted for only 20 minutes. For around $5 it hard to be upset
Works as expected
Does the job
Worked like a charm! Plugged it in and the bike started right up!
As good as described
Worked
Bought to modify for use on an 83’ Yamaha G1 Golf Cart. Not only works great, but runs better than stock! Bought a spare, but haven’t needed it, works great
Worked great for me in rewiring for 1982 Yamaha gas golf cart
Plugged right in to Honda ATC185 (1981) and starts first pull will report back how long it lasts
Works like an oem cdi box for my tao tao db17
Nice performance... fit perfect for a 110cc Chinese kids atv...
Accurate description, worked great.
Makes it fire.no problems
great would buy again
Perfect
go it runnning