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CDI Trouble shooting

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james Ashworth

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Hi I have built 2 CDIs one works and 1 does not. I belive it fault lies with the zener diode 4.7v, 0.5w that protects the gate the SCR as it works for a few sparks, then works intermittantly, then not at all. Guessing it stops doing it's job as it gets warm. Got a circuit diag to share if it will help. Any help would be appreciated.
 
CDI.jpg
 
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