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2009 KTM 250 XC, 2 stroke.
Racing last weekend at the JDay Sprint Enduro, all was fine, started a segment, felt a tiny change, maybe a bit of friction, then suddenly bike is running like crap, bogging under throttle, semi recovering off throttle, then just died.
Track side diagnosis was no spark, checked all the obvious things, no Joy, headed home. (new plug, kill switch, grounds, harness connections, etc)
Yesterday i dove in to it.
Took the stator cover off and i was right, the nut on the flywheel had backed off too the end of the shaft (lock washer was smooshed flat, not exactly doing it's job). i'm assuming this was the friction I was feeling. it probably contacted the stator and caused a surge/short?
Broke out the multimeter:
all continuity in the stator is good.
All resistance seems good also (using ranges found online, don't currently have a service manual, it's in the mail now).
Tested the coil next and have continuity across the grounds and its good, but there is NO continuity from the CDI input to the coil and the plug cap (so power in to power out). No resistance either.
To me that sounds like the coil is shot, which is great because its cheap (and already ordered), but in order for a short to GET to the coil, it had to travel through the CDI, which would NOT be great.
I HATE just throwing good parts at it trying to fix things. Any way i can test the CDI? Any other thoughts on wtf is going on? hopefully i'll have the manual by the weekend and have actual resistance values to confirm, but could a few ohm difference in the stator really cause a no spark condition?