Depends on the bike.
Not too fast
63mph
Not as fast as a GSX-R1000
108.5mph
around 80
about 90 mph
A ktm 65sx will go about 43 but with fmf pipes it will go close to 50
Very Slow! KTM's are NOT worth the money AT ALL!!
Extreamly fast, my friend got clocked at 90mph
around 160-165mph.
130mph
About 123.7 mph