the average spped is 1mph and people like Courtney bratton cant ride them
the MX350 goes around 14 mph
As fast as you want. Again this depends on your gearing, if the track is hard packed, long strights, long jumps with smooth landings, go with a smaller rear, larger front gears, the faster you will go. For deep, thick, heavy, or muddy tracks, you will want a larger rear, and smaller front gears for the torque.
fast enough
about 40mph
210
about 60mph
it all dipends on the bike
A 70cc dirt bike will achieve a top speed of around 40mph
not very fast
55 to 60 its fast
how fast does 250cc Orion dirt bike go
1 mph
59 hp
16.557 fps