My crm losse the Power immedietly on middle rpm. The noise from muffler changed for much more lower (bass). Starting Perfect, low and high rpms ok. When i restart Engine everything go normal. Now i clean all electrical connections and its ok. Carb? Power valve? I'm 500 km's after rebore, New piston and power valve cleaning.

Sounds like [ no pun intended ] your PGM might need a return trip to Nick in Greece .
Mike

And sometimes i heards knockinng then rpms are constant and when i spin of the throttle and i pull clutch on top of cylinder or maybe bottom (im not shure). What do you think? I need pgm recond?

You could try altering the needle position, go one position richer [ clip down a notch thus raising the needle] see if that makes any difference either way. The filters all clean I assume, and the plugs a newish one?
Mike

CRMs are renown for their 'knocking' noises. Some do, some don't. Mk2s seem to be the worst. I've tried a lot of different barrels on the same bottom end and they do vary. I put it down to noise from the power valve but following FMtB's recommendation will do no harm.

is the powervalve moving as it should? pop the cover off and watch it while you rev the bike.

Air filter cleaned and oiled. Plug is old but clean and work (but i will change for New one) i will make a video of PV working.

Pv is opening and closing but i think itd not smooth

should be like that.

Make sure its going the right way.

https://www.youtube.com/watch?v=z51cA0cLKgE

have you cleaned the carb? noise with more bass could be bogging which is a lean condition. Other option could be crank seals but if idle and top end are good tis is unlikely. My guess is carb or powervalve.

It was the same like in this movie but i've checked this after problems, now is ok i will check when the problem come again. Now i dont touch the bike from 2 weeks becouse my first child was born week ago

maciej_mi wrote:It was the same like in this movie but i've checked this after problems, now is ok i will check when the problem come again. Now i dont touch the bike from 2 weeks becouse my first child was born week ago

Congratulations

Thanks! Unfortunetly the reason of noise was freezed rc valve. On the position maximum to the turn out direction. Its in 100% pgm defect? When i restart it going ok. When i run constant rpms its shorting. CRM nots run smooth Power valve also. Before rebore pv wasnt sticking but Engine was shorting.