2000 mph
I don't have a 5 HP go-kart.
This question cannot be answered with this information. There are too many variables like gear ratios, weight of the vehicle, etc. 5hp push lawn mower = 0mph. 5hp go gart = what, maybe 30mph 5hp engine in my car = not very fast!
fast
it will run 55-60mphbecause I have one and I got it up to 60mph.
80mph
Accelerate around the corners
50km/hr
about 40mph
Not very fast, possibly about 25 mph.
the best would be to use 10w-30 synthetic oil all year long
40-50 mph
faster than the others