Plug/wire first. Replace the plug with a KNOWN good one. Make sure the wire is screwed into the cdi box properly and that the cap is screwed onto the wire as well, check each step with your multi-meter as you go. Double check all connections.

Look for metal chips in the mag, something I found on all of my new engine kits.

Keep us posted as to your progress.

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If it ain't broke, and you mess with it long enough, it will be.