2023 KTM 125 XC wont start?

Joshua Knight

Got a 2023 KTM 125 used from a buddy who put a ton of work into it. Put about 10 hours on it and now it wont start. Engine turns over, but fuel pump isn't kicking on, and zero spark. Hour meter wont work either. Was riding it then it decided to turn off randomly. Turned on again for about 4 minutes then powered off again. Wouldn't start then left me pushing it. Started again after i washed it, then wouldn't start the next day. Has a custom TSP ECU with no map switch if that makes a difference. Could it be a sensor not letting it start? Think its quite strange it just cuts out. Anyone know? Thanks

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Factor E
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Factor E 4/8/2024 9:06pm
4/8/2024 9:06pm Edited Date/Time 4/8/2024 9:07pm

try another CDI box   at one time there was a recall on the box

mxdoctor
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mxdoctor 4/9/2024 7:33am
4/9/2024 7:33am

The MY23 KTM 125 has an ECU, no CDI box any longer... I would check first battery, if it´s charged by the voltage regulator and then try another start-stop switch, perhaps it sticks on the Off position,then look into ignition and wiring harness, start relay and fuses there, they are also sometimes drowned in water and rusty like hell...

CodyC
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CodyC 4/9/2024 8:00pm
4/9/2024 8:00pm

I would check the battery.  I know those bikes can get weird with low battery.  I'd try it with a jump pack.  I'd also make sure to try with a new plug if you have any doubts on yours and your aren't getting spark.

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