If you are talking about a klx 450r, then the answer is 96 mph.
70mph
160
215 mph with out speedometer limiter
About 73 mph.
at least 100
I have been 77mph on mine
My 2007 450R with HRC kit will run around 85mph
the top speed is 65-72.3
Top speed = 110mph 0 - 60mph = roughly 7 seconds
same as the trx 450
it will go from 75 to 80 stock.
It's goes around the 25 lower 30's