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CDI Box
Have you tried a new CDI box? I got the blue one in two of my 50cc's and it makes a world of difference. I've heard of some people having bad experiences with misfires, but I suspect that their spark plug was loose, but beware that there are those who have blown their carb. I blew a carb when I put my most recent upgraded one in, but that was my fault for not tightening down the spark plug. In any event, that is a really quick fix for like ten dollars on Amazon--a little more for the performance ignition coil and performance spark plug, not sure if they are really worth it or not. But definitely the CDI box--blue or orange.
Also, look into removing the restrictor collar from your CVT. I haven't gotten that far yet because I am waiting for the tool to come in, but I will let you know how that worked for me.
Performance air intake and exhaust that lets more air flow through is always an added bonus, but with only the CDI box and a carb adjustment, my X-Pro Maui 50cc goes between 32 and 40 mph on flat ground, and I've hit 52 mph with a modest incline, faster on steep hills.
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