Your stock CDI is best suited for the buggy since it was designed around the heavier buggy. You must realize one thing. Spark does not make any power. What makes power is the amount of fuel and air you cram into the cylinder prior to ignition. A stock engine will only fill a cylinder to maybe 65%. Your power will be made mostly in the head and cam. Your carb problem is due to the lean state these engines need to pass the EPA. You will need to rejet the carb especially after installing the new filter since you will be pulling in more air on an already lean running engine and this will eventually burn the engine up. Rejetting will improve power since you now pump more air/fuel into the cylinder.
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