OTOHANS AUTOMOTIVE ATV Wiring Harness Kit for 50–125cc 4-Stroke — Complete Loom with CDI, Regulator & Starter Relay (Black)

Complete replacement wiring harness kit that supplies the CDI, regulator/rectifier, solenoid relay, ignition coil, spark plug, ignition switch and starter button for 4-stroke 50–125cc ATV and pit bike engines.

If your 4-stroke ATV, quad, scooter, go-kart or pit bike with electric start is suffering intermittent ignition, charging faults, missing starter components or a damaged loom, this all-in-one kit from OTOHANS AUTOMOTIVE gives you the core electrical parts needed to restore function. The set is built to match common 50cc–125cc four-stroke setups (non-GY6 engine types) and bundles the wiring loom with the main electrical components to simplify replacement and reduce parts hunting.

What does this wiring kit include and why are those parts important?

The kit combines the loom with all essential ignition and charging hardware so you replace multiple failing parts at once instead of troubleshooting each component separately. That approach saves time and ensures connectors and wire lengths are compatible.

• 1x main ATV wiring harness with factory-style connectors for sensors and switches
• 1x 5-pin CDI unit to manage ignition timing and spark control
• 1x solenoid relay for safe starter engagement
• 1x rectifier/regulator to stabilize charging voltage
• 1x ignition switch with two waterproof keys for theft deterrence
• 1x start button plug, 1x ignition coil with lead, and 1x spark plug for immediate engine restart

How do I know this will fit my ATV or pit bike?

This wiring assembly is designed for many 4-stroke 50cc–125cc small-displacement engines used in ATVs, dirt bikes and buggies, but it does not suit GY6-style engines. Verify compatibility visually and by connector count against your vehicle before installing.

• Fits 50cc, 70cc, 90cc, 110cc, 125cc four-stroke engines (common small-ATV and pit bike platforms)
• Not compatible with GY6 engine designs—compare plug shapes and CDI pin count
• Check that your machine uses an electric starter and matches the included ignition switch layout

Can I install this myself, and what should I watch for?

If you are experienced with motorcycle/ATV electrics, the harness and components are designed for straightforward replacement. However, if you are unsure of wire routing, connector mapping, or grounding points, professional installation is advised to avoid damage or safety risks.

• Study the wiring photo included and map every connector before disconnecting the old harness
• Confirm secure grounds and correct polarity on the rectifier/regulator to prevent charging issues
• If uncertain, hire a mechanic—incorrect wiring can harm electronic components

What practical benefits will I see after replacing the harness?

Replacing the loom and core electrical parts at once can eliminate intermittent starting problems, restore reliable charging, and remove corroded or damaged connectors that cause electrical faults. You’ll gain a clean, organized wiring layout and new keyed ignition security.

• Improved starting consistency and reduced stalling from fresh CDI and coil
• Stable charging and battery preservation with a new rectifier/regulator
• Waterproof ignition switch and new starter relay for dependable electric start

Who is this for: This OTOHANS AUTOMOTIVE kit targets owners and repair shops working on small four-stroke ATVs, dirt or pit bikes, go-karts and scooters that need a full electrical refresh or replacement harness. It’s a practical choice for anyone replacing multiple aging or damaged electrical components and for mechanics rebuilding or upgrading 50cc–125cc electric-start machines—provided the engine is not a GY6 design. If you have doubts about fit or wiring, consult a mechanic or contact the seller with model details for confirmation.