Forums 🚥 PiT STOP 🔧 Hyosung Technical Help No Spark. No 12v to coils :(
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♠️ M77.
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Apr 22, 2026 at 9:29 PM #22376Bike Model = : GT125R
Hi guys,
feeling pretty desperate now feel like I’ve check everything and would love to be able to ride my first bike this summer.
Anyways, the situation is no spark. 2.3v to one coil and 0v to the other with ignition on. I’ve replaced: stator and pickup, coils, spark plugs, cdi unit, rectifier regulator, battery
2.3 v and 0v to the cdi unit aswell.
Ive recently found a pretty crusty diode pack – not sure what responsible for doesn’t effect volts to coil when unplugged
Any help / advice would be much appreciated !?!?
Or if anyone knows where I can find a replacement wiring loom for it? Previous owners been tinkering with wiring loom I fear! -
Apr 23, 2026 at 9:19 AM #22379
is it possible to upload a picture to this forum , we need to see the harness near the battery and also the dashboard, this will tell us if its an RC model or older R model, if the last owners have been making a botch job toit or not.
Hyosung doesn’t make new looms for GT anymore, so we have to preserve what you have.
Blue-wire ends up at the CDI (Rear Coil) and Yellow-Black wire is at the CDI for front coil (which is shared with stator and dashboard for rpm signals)
Here is a CDI pin out too (See reply from @Cobra2)
Needing a little help with my current project (+GT125 CDI PIN OUT)
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