Being the buggy is used and new to you, you need to check everything including the cvt, compression, valve adjustment. Things you have to have " good compression, good blue spark a good proper mix of air and fuel " for the engine to run and perform. It is a process of elimination. You know you have a good spark. Do you know your compression, jetting, proper valve adjustment, condition of CVT system? Just like going to a doctor there will be several specs he'll need to know about you weight, age , height, BP than your reason for visit with several questions pertaining to problem. Just like a doctor the more accurate info you give (not assumptions or guesses) the easier to diagnose the problem. That manual will guide you through the checks for the info you need to diagnose the problem. Once everything is known about the overall condition and it checks good than you would suspect the CDI. Normally the CDI either works or don't, but in very few instances I have had the limiter go bad as not to allow the normal RPM output needed to get up to speed, and at times just the wrong or new defective CDI. The reason for the CDI be suspected last is that it is the only component that cannot be checked. A video would be helpful.
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