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Im trying to get my old go-kart running but i need help choosing a good engine at a descent price. I currently have a tecumseh 5.5hp in it now. What kind should i go with

So i just currently put 1 one a custom bike i was making and i love it. What do yall think of them? I read that there also coming out w. the 40 series that can handle more power. Does any one kno about how much power the 40 series would be able to handle?