2023 Kaw ZX4 rr 135 Mph @ 46 sec

Top of 5th gear, ran out of road.
2500' elevation, 90 deg air temp.
I suspect it would get to 137 to 140 mph with better air.
Top speed , stock, was 122 Mph in the same place.
ECU flash by V Cycle Nut and full Graves exhaust made it 13 Mph faster, so far.
Thumbnail picture when it still had stock exhaust.

[@mustang32758]

Have you done any gps testing at that speed. I found that my ZH2 is pretty far off at that apeed and higher. Plus 10mph above 140 to 160. My zx4rr is off also at cruising speed, i have to check it at 100 but it could be 6 plus

[@rudedog3529]

Haven't really been that motivated. Most bikes are off about the same. I just compare one with another as indicated speed. The altitude i run the fast bikes at ( 5000" ) probably handicaps them as much as the GPS would.

[@badslitter5504]

How does it ride on S6 compared to your 650 as far as handling?

[@rudedog3529]

Hard to say. They weigh about the same with 650 having more low end and the ZX4rr having a wider power band at high rpm.