as fast as you want it
my son was clocked by the state police at 100 mph
kx 125 is better because KTM 125 or any ktm snap so go with kx 125
As fast as it can.
no the 1985 kx 125 cylinder will only fit years 85-87 kx 125s
no i have a 2000 yz 125 and can beat a kx 125 blind folded
70
about 90mph :)
Yes
Not aware of a KX300.
40 mph
60 -65