If you are talking about a klx 450r, then the answer is 96 mph.
160
About 73 mph.
70mph
I have been 77mph on mine
at least 100
My 2007 450R with HRC kit will run around 85mph
same as the trx 450
it will go from 75 to 80 stock.
With 13/48 gearing should be in the 75-77 MPH range.
I heard the Suzuki has more top end speed but the YFZ is quicker
Approx. 70mph to 75mph is the max. speed of this Honda trx 450r.