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Very odd indeed. A bad coil (shorted turns) could cause that but the chances of both going bad at the same time would be extremely rare.



It is possible that the CDI has leakage in both of the high voltage caps but then it probably wouldn't run worth a darn if at all.



With the engine not running but the key on measure the input voltage at the coils.

In theory, with a CDI bike there shouldn't be any voltage present.



The way a CDI system works is there's nothing on the coils, when it's ready to fire it pulses several hundred volts through the coil primary but only for a few milliseconds.
 

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My car has done that twice and it pisses me off to no end when I can't locat where the smoke came from, can't see any obvious damage yet it runs just fine afterwards.
 
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