Hi
Welcome aboard
Pleased to meet you
A 2 stroke is more powerful then the same size 4 stroke engine
http://motorscooterguide.net/Article...OR4Stroke.html
So if you want to equal or exceed your Zumas performance with the 4 stroke nitro a BBK kit install to increase your engines displacment imho is the only option
You will have to fine tune your cvt as well, roller weights and springs
Take care and ride safely
Yours Hank
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