EOPOAYI Pit Bike Wiring Harness Kit — Electric-Start 50–125cc Complete Replacement with CDI & Regulator

EOPOAYI Pit Bike Wiring Harness Electric Start kit is a complete replacement wiring system designed to restore ignition, charging, and electric-start functions on 50–125cc four-stroke pit bikes and ATVs.

If your small-displacement dirt bike or quad has intermittent starting, dead charging, or damaged wiring, this EOPOAYI kit supplies the major electrical components needed for a like-new electrical system. The package groups the main loom with ignition coil, CDI box, solenoid relay, rectifier/regulator, handlebar switch, key switch, spark plug, and mounting ties so you can replace aged or faulty parts in one service session.

What bikes and ATVs will this wiring harness fit?

This harness is made to suit many popular small four-stroke models from 50cc up to 125cc. It’s compatible with a range of Chinese and budget-brand machines, plus several common aftermarket and OEM-style pit bikes and quads.

• Fits 50cc, 70cc, 90cc, 110cc and 125cc 4-stroke pit bikes and ATVs
• Known fitments include TaoTao, SSR, Apollo, Coolster, Sunl, Lifan, Loncin and similar models
• Also compatible with common NC50-style mini-motorbikes and small quad platforms

Which parts are included and how do they help restore functionality?

The kit bundles each core electrical component so you can address starting, ignition timing, and charging at once rather than chasing individual failures. Each piece is intended to meet standard specifications for interchange with common 4-stroke small engines.

• Main wire harness/loom to route electrical circuits and connectors
• Ignition coil and A7TC spark plug to deliver reliable spark
• 5-pin AC CDI box for ignition control with electric-start compatibility
• Solenoid relay, voltage regulator/rectifier, ignition key switch and handlebar switch included
• Ten zip ties and mounting points for tidy installation

How difficult is installation and what should I prepare?

Installation requires basic electrical knowledge and mechanical access to the engine, battery area, and handlebar wiring. Follow the supplied wiring diagram closely, verify each connector match, and use proper tools—incorrect assembly can prevent operation and risk damage.

• Recommended: examine product photos and compare connector shapes before buying
• Use a multimeter to verify continuity and correct voltage during installation
• Professional installation is advised if you’re unfamiliar with CDI systems or regulator wiring

Who is this for? The EOPOAYI wiring harness kit is aimed at riders, repair shops and home mechanics working on budget-friendly pit bikes and small ATVs who need a full electrical replacement instead of piecemeal fixes. It’s practical for refurbishing a project bike, returning a non-starting quad to the road, or stocking parts for common small-engine repairs. Buyers should confirm fitment against their machine’s connector types and wiring diagram, and prepare for a methodical install or professional help if wiring experience is limited.