It never hit the rev limiter if that's what you mean.

Mine is having an issue where at 80 kph 54mph it's bouncing off red line I got some mucky water in my case though gonna have to pull it open five it a clean and service

[2015 Z Force 800 53/Trail EPS]

I have a little update. I was having a top-end problem in that I couldn't reach anywhere close to the RPM limiter. I found that my prefilter on the mushroom filter was being sucked-down to the filter so I removed it and changed the dual stage filter material to a single stage. Today I took it for a run. It helped..but didn't cure the problem. As it reaches speeds over 50 it seems the higher it gets, the longer it takes to get there. Its like its fighting something. I did reach 65 but still had a ways to go to the limiter. I opened my flip windshield and although I don't want to go past 40, it did reach 40 much faster open then closed. So..maybe these windshields and rear shields are having more effect on these then we think.

Oh yeah windshields have a BIG effect on the speed.  As an example try to hold a piece of ply wood that is 1'x1' out the window at 55mph.  If it doesnt fly out of your hands it may well break your arm.  Now multiply that by about 5 for a half windshield and by 15 for a full.  Now imagine those forces. 

[2015 Z Force 800 53/Trail EPS]

Oh yeah windshields have a BIG effect on the speed.  As an example try to hold a piece of ply wood that is 1'x1' out the window at 55mph.  If it doesnt fly out of your hands it may well break your arm.  Now multiply that by about 5 for a half windshield and by 15 for a full.  Now imagine those forces. 

Exactly. That's how it acts...and feels. And the windshield is the only change I made between being able to hit the limiter and now not being able to.  That means the 600s and 500s would struggle even harder.. and to reach even lower speeds.