Grand Prix 500
Main Motorcycle: 2018 T120 Bonneville
Join Date: Jan 2019
Location: Rockford, MI
Other Motorcycle: 00 Ducati Monster 900
On a 2018 T120 less than 5000 rpm, I changed to a 42 tooth rear sprocket from the 37, so mine rev's higher but I was still below 6000 rpm.
Before the sprocket change the 4000 rpm limit of breakin, was about 80 mph
If your are under redline it should be fine. You will need a windscreen of some sort, 90 on a naked bike is hard work after 30 minutes.
It is what it is, until it isn't