Just bought an 84 ATC110 for my kids, it's not getting any spark, I changed the plug and still nothing. I have done a little looking around and haven't been able to find much out, I don't want to buy a new CDI if possible, does anyone know of any tests to narrow this problem down? Any ideas would be appreciated

 

Here are the tests .. The CDI test won't be accurate unless testsd with an old analog Sanwa SP10D or SP15D ..

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Thanks, I will start there.