FKT 12V CDI Engine Swap Wiring Harness — Full Lighting & Turn Signals — CT70 / Z50 / CT90 +

FKT 12V CDI Engine Swap Wiring Harness

The FKT 12V CDI Engine Swap Wiring Harness is a complete wiring solution designed to simplify installing a modern aftermarket engine into your mini bike while retaining full functionality.

Originally developed for our CT70 Full Harness Kit, this standalone version gives you a clean, reliable way to wire electric start, full lighting, and turn signals without piecing together a custom setup.

Features:

• Electric start integration
• Full lighting support (headlight, taillight, brake light)
• Turn signal wiring built in
• Clean routing for engine swap applications
• Includes full color printed wiring diagram

Compatibility:

This harness is designed to work with horizontal 2-wire AC CDI engines with dual lighting outputs.

Typical wiring includes:

• Blue/White — trigger
• Black/Red — CDI power
• Two lighting output wires (commonly):
• Yellow / Yellow
• Yellow / White
• Yellow / Pink

Common applications:

• CT70 and clones
• Z50 / Monkey
• CT90 / CT110
• CL70
• Honda Cub and similar bikes

Best suited for bikes with battery and electrical components mounted near the seat and standard mini bike frame routing.

Connections & Layout:

This standalone version uses a mix of multi-pin connectors and standard terminals to keep the install clean, modular, and easy to service. For DIY systems, please check out our DIY Harness Bullet & Pin Connector with Crimper Kit to be sure you have everything you need to get your custom components connected.

*Fuel level sensor connection is only available on full wave versions.

Electric Start Compatibility:

This harness is designed to support electric start setups but can also be used on kick-start only engines.

• For electric start engines: connect starter solenoid and start button as normal
• For kick-start only engines:
  • Leave the starter solenoid and start button connectors unplugged
  • Tape off or remove the additional red battery jumper wire

Setup Notes:

• BMC aftermarket motors are FULL WAVE and will run full DC power to all lighting and electrical accessories
• Non-BMC engines may be either FULL WAVE or HALF WAVE depending on stator type
• Be sure to select the correct stator output before purchasing

If you are unsure what stator your motor has, check out our guide here:

How to identify your stator type

This is a proven setup we have used across countless builds. If you are looking for a clean, reliable way to wire your engine swap without cutting corners, this harness gets it done.