No power in the middle range [MK3]

[maciej_mi]

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.

[fallenmikethebike]

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

[maciej_mi]

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?

[fallenmikethebike]

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

[knackeredMk1]

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.

[gregorious77]

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

[maciej_mi]

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.

[maciej_mi]

Pv is opening and closing but i think itd not smooth

[gregorious77]

should be like that.

Make sure its going the right way.

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

[gregorious77]

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.

[maciej_mi]

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

[jompy]

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

[maciej_mi]

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.