It could be either the kill switch or the coil in the mag that triggers the CDI, sometimes called the exciter coil. The only way really is to swap known good parts for the ones on your bike. How did you test the CDI box? Feel free to email me to keep the traffic on this site down to the usual travellers stuff. My email is in my profile.
Regards
Nigel
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The mouth of a perfectly contented man is filled with . -- 2200 BC Egyptian inscription
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