I recently purchased a performance kit from J and J, with carb, air filter coil and racing CDI. When I put the new CDI in, it blew the fuses. Replaced the fuses, tried again, same result. Had to put the old CDI back on. I haven't put any of the other components on as a result. Any ideas will be appreciated.

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    What is the current rating of the new ignition? What size are the fuses that blew?
    – vini_i
    Commented Aug 13, 2019 at 19:17
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    ... and are you sure you have the new CDI wired correctly? Commented Aug 13, 2019 at 20:20

1 Answer 1


An AC version of the CDI will blow the main fuse if installed in a Kymco DC scooter. Sometimes it's difficult to tell one from the other, they look similar. Make sure you're installing a DC CDI, not an AC.

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