is it normal? right power valve cover EC300
 

https://youtu.be/qBF5b0GxLQQ

looks like it have some free play ?!

Some free play is normal.
It can be adjusted out. Do a search on power valve adjustments.

By the way.
Avoid moving the power valve lever like you're doing.
Sometimes the governor balls can become dislodged.

can't find anything about its adjustment
Can someone help?

https://www.youtube.com/watch?v=hmz9cij6MVY

this guy explained it realy good, you just need to adjust the knob that touches the governor, to remove free play.

Here also.
http://gasgasrider.org/html/pv_disassembly.html

I'm understood, thank you!

Hello friends
So I adjusted my PV.
And here is the result I got.

https://youtu.be/nY0fq1kaNJE

Should this slider reach the top bolt?
In the video, it does not reach the end, the valve is closed by about 2 mm in this position. But it should be noted, I think I did not reach the max rpm, because I could not warm up the bike well, and it was very rich.

Has a ride yesterday, it looks like it is necessary to change jets, I did not understand this because of this edjust of PV, but it seemed that there was not enough power at max revs. At the same time, it seems good pulls at low.

what year is your bike? does it have the preload tensioner?

this mechanism: https://www.youtube.com/watch?v=lu3T-ctnzKY

if it have maybe it has some preload and not letting the PV full open.

Mine has that mechanism, and i have some tension on my PV so it does not fully open, and as a result i have more low end power, losing some top end power wich i dont need any way.

2011 and there is no such mechanism.
It seems that I did such a preload when i adjust my PV ...