The big wheel version's i would expect to hit around the 65-70 mph mark.
60 -65
stock it will go 60 to 75 but with a pro circuit fat pipe it will go 60 to 80
As fast as it can.
if it has pro circuit racing parts 2 stroke it goes 60 to 80 mph
i got mine to go 95
about 90mph :)
70
as fast as you want it
the kx is faster
It goes 63-65 kawaski is better I have a kx 80 and it goes 75 with my procircuit pipe 67 without it
40 mph
Not aware of a KX300.