OTOHANS AUTOMOTIVE Complete Wiring Harness Kit for 50–125cc 4‑Stroke ATVs — CDI, Stator, Ignition & Solenoid

Complete electrics kit for 4-stroke mini ATVs and dirt bikes — a full wiring harness with CDI, stator, relay, ignition coil, solenoid, spark plug and all mounting hardware to replace or upgrade 50cc–125cc electric-start engines.

This universal wiring loom package from OTOHANS AUTOMOTIVE is designed for Chinese-made 4-stroke upright engines commonly found on ATVs, pit bikes, go-karts and scooters. It consolidates the core electrical components into one boxed kit, with clear wiring diagrams and installation instructions so you can restore ignition, charging and starter functions without sourcing parts individually.

How will this kit restore my ATV’s electrical system?

The kit replaces the primary electrical components that control spark, charging and starter activation. By swapping the harness, CDI and stator you re-establish timed ignition and charging regulation, and the solenoid plus ignition switch enable electric start operation.

• Includes CDI (5-pin AC), stator (magneto generator), ignition coil and spark plug for ignition.
• Rectifier/voltage regulator and extended wiring for improved charging connection.
• Solenoid relay, ignition switch (waterproof with 2 keys) and fuse for starting and protection.
• Detailed wiring diagrams and cable ties simplify installation and routing.

Which engines and models are compatible with this wiring harness?

This harness is built to fit most Chinese-made electric-start upright 4-stroke engines from roughly 49cc to 125cc. It’s intended for mini ATVs, quad bikes, pit bikes and go-karts that share common connector types and electrical layouts.

• Compatible: 50cc, 70cc, 80cc, 90cc, 100cc, 110cc and 125cc Chinese engines.
• Fits many brands: Taotao, Coolster, Sunl, NST, Kazuma, Baja, Buyang, Roketa and more.
• Fits models like Kawasaki KLX-style 4-wheelers and most Chinese 4-stroke mini ATVs.
• Not for GY6 motorbikes or 200–250cc Zongshen/Lifan engines with different stator/CDI designs.

What’s included in the box and what changed in this upgraded harness?

The kit is supplied as a complete loom with all the commonly replaced components, packaged in a color box with instructions. The upgraded wiring extends key link lines and includes improved connectors for easier routing and reliable connections.

• Box contents: wiring harness, CDI (5-pin AC), solenoid relay, rectifier/regulator, ignition switch with two keys.
• Also includes upgraded multifunction ATV switch, stator, ignition coil with lead, spark plug and fuse.
• Hardware: 10 cable ties and a wiring diagram to guide installation.
• Upgrades: extended rectifier, stator and battery lines plus a brand-new fuse for protection.

What installation precautions should I follow?

Careful matching and correct polarity are essential. Confirm model compatibility before purchasing and follow the included wiring diagram exactly to prevent shorts or damage — older vehicles with degraded insulation may not be suitable without additional repairs.

• Red wire = positive, black = negative; follow the diagram for each connector.
• Do not connect the relay negative to ground; the relay requires the specified positive terminal hookup.
• Avoid fitting to very old vehicles where wiring insulation is brittle to prevent short circuits.
• Confirm engine and stator/CDI type if your vehicle is outside the listed Chinese 4-stroke models.

Who is this for: Riders, mechanics and DIY restorers who need a single-source replacement for an ATV or small dirt bike electric-start electrical system. It’s best suited for owners of Chinese-made 50cc–125cc 4-stroke ATVs, pit bikes, quads and go-karts who want to swap a failing harness, restore electric start and charging function, or upgrade worn connectors. If your vehicle uses a GY6 motorbike electrical layout or a 200–250cc stator/CDI, choose a model-specific kit instead.