gear ratio, wheel size, tire size, and rider weight have more to do with speed than the engine.
think about it, you can make a 100 h.p. 4 cylinder engined car top out at 200 mph with the right gear ratio.
you can make a 600 h.p. big block v-8 engined car top out at only 100 mph with the right gear ratio.
of corse, it may take the 100 h.p. 4 cylinder 15 miles to get up to 200 mph, and it may only take the 600 h.p. big block an 1/8 mile to get up to 100 mph.
on the other hand a 100 h.p. engine in an 1800 pound car will be faster than a 100 h.p. engine in a 3600 pound car.
there are a lot of variables to making something fast.
something being fast isn't the same as something being quick.
a fast car can run 200 mph over a long distance. a quick car can run 200 mph in a very short distance.
everyones every day car can run 115 mph over the right length of time, but put that car on a drag strip against a car with less h.p. than is geared to be quick, and the every day car will lose every time.