Really confused

Well, generally, the more horsepower the faster- but the Honda GXH50 will rev to over 7000 rpm while the larger 5hp (if stock) will probably do 3500-3800- that just affects how you gear it down, though. The other issue is that if you have 3 times thw weight for twice the power- at a point, the added power is just being used carrying around the weight- and giving no more speed. Finally, with a 2.5 hp Hond, you can probably get 40 mph or better out of it with the right combination of parts. How fast is safe on a bicycle?
 
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