If this is truly 4 hp, that's pretty underwhelming.
Seems like there are better choices these days.
Growing up a neighbor kid had a go cart with some kind of 2 stroke motor on it, I didn't see it enough to know how fast it was.
I on the other hand built one and put a 7-8 hp 4 stroke motor on it. With the gov removed it would do about 70 mph, (feels fast when your laying down 1/2" from the road) at least until the engine scattered it's self all over the road one day.
(apparently there is a reason for those governors.)
Seems like there are better choices these days.
Growing up a neighbor kid had a go cart with some kind of 2 stroke motor on it, I didn't see it enough to know how fast it was.
I on the other hand built one and put a 7-8 hp 4 stroke motor on it. With the gov removed it would do about 70 mph, (feels fast when your laying down 1/2" from the road) at least until the engine scattered it's self all over the road one day.
(apparently there is a reason for those governors.) 
