I had a 1989 FJ1200 I bought new. It would go 65 mph in 1st gear and 165 mph in 5th gear. The only reason I didn't ride it faster was at 165 the engine rpm was in the yellow on the tachometer. The bike was still accelerating strongly at 165 and I truly believe it would have gone 180 with another tooth on the countershaft sprocket.
fast
if it is a Yamaha wolverine 450 it will go 61mph
a Yamaha blaster can go around 75-80
155mph
Not that fast but about 50 with no upgrades
the Yamaha ttr125 goes about 50 to 55 mph
About 75 mph
about 70 to 80mph
700mph
2099
75-80mph
60-70mph