A/C CDI Coil Combo 150cc QMJ157/49cc QMB139 (Plug & Play)

This is the ultimate EVI for GY6/QMJ157 150cc and QMB139 50cc systems. If your scooter feels held back by the stock rev limiter or weak spark, this CDI/coil combo is the fix — stronger spark, better throttle response, and more of the power your engine already has.

The Details ⚙️

This EVI replaces both your stock CDI box and ignition coil with one compact, microprocessor-controlled unit designed specifically for A/C CDI systems on GY6 QMJ157 and QMB139 engines.

It delivers roughly 32,000 volts to the spark plug, giving you a hotter, more consistent spark while also removing the factory rev limiter. The result is better throttle response, improved acceleration, and access to the RPM your engine was being held back from.

What this upgrade does:

• ⚡ Replaces CDI and coil in one unit
• 🔥 Outputs roughly 32,000 volts at the plug
• 🚫 Deletes the factory rev limiter
• 🎯 Uses microprocessor timing control for stronger performance
• 🔌 100% plug-and-play with existing CDI connector
• 📏 Includes a 38" plug wire that can be trimmed to fit your layout

Simple install, big difference — one of the easiest ways to wake up an A/C GY6 or QMB139 setup 🔥

What's Included 📦

• ⚡ Integrated EVI CDI / Coil Combo Unit
• 🔌 Plug-and-play connector setup
• 📏 38" spark plug wire

Important Things to Note 🚨

• Designed for A/C CDI systems only.
• Fits GY6 QMJ157 150cc and QMB139 50cc engines.
• This will NOT work on DC models.
• Use common sense with RPM limits — removing the rev limiter does not make the engine indestructible.
• Plug wire can be shortened if needed for cleaner routing.

Not sure if your scooter is A/C or D/C?
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Need help confirming fitment? Message us and we’ll help you sort it out 👍