5-Pin AC CDI Box for Chinese 50cc–125cc ATV Pit Bike Dirt Bike

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.