Engine noise, power loss.
 

Hi guys! Thanks for this forum- i found many good advices before but now i need help.

I'm now after 3000km trip on my Tenere (2008, 29kkm). The problems appeared in the middle of journey.

At the trip when i took of my helmet i heard weird engine noise- not tickling, klicking or smth- more just like metalic scratching, frictioning- whole bike is more vibrating. The sound is heard on left side of engine a little in back. When slowing down i think there is more air sound like pff pff pff- with high frequency. Moto started popping more often (not like always when slowing down about 2600-2900rpm but above 3000rpm and more). Now when engine is cold it makes a very loud bangs from exhaust just with low reving. I also get uncontrollable engine stops when idling, gear change- just few times but its disturbing because before the Ten didn make such a things.
Clutch lever on/off dont change anything in sound.
I observed a little power loss at bottom of rpm (normaly Tenere is jerky in the bottom of revs but now whole bike is bouncing).
I did little maitenance (oil change, valves adjustment, cooling liquid, spark plug) but nothing changed.
For me is a sound of faulty bearings but dunno exacly.
Any ideas what i should looking for?

Thanks!

I added some video for you but its hard to explain which sound i mean.

https://www.youtube.com/watch?v=0vMC-JED7W4