I would start by installing the stock cdi and carb after a good cleaning. By good cleaning I mean to totally disassemble the carb let it sit overnight in some Barryman carburetor dip. After soaking in dip remove and rinse under warm water while scrubbing with old tooth brush or like. Using small wire, push through all small orifices then blow out with compressed air than reassemble carb. Keep it all in original stock configuration. 99% of the time if the cdi goes bad you will have no spark.
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