about 60-70 mph
fast
Depends on the make and model. If it's a utility, you'll be lucky to hit 30. If it's a sport model, you could potentially hit 80.
if your racing then a Honda 400ex, but if your working polaris makes a 425
A 250 ATV can go from 80 to 120 kmh
it will go about 100mph
Replace your sparkplugs.
52 MPH
175
55mph
About 60mph
200mph