Hello friends!!! My name is Kalin and I am from Bulgaria. In March this year I bought a brand new V-strom 650 from Romania. Why from Romania...because in Bulgaria it cost 2000 euros more. Whatever. Unfortunately, the Bulgarian distributors did not want to service the bike under warranty, so that I had to go from Varna to Bucharest for the first oil change, which was at 1000 km. At the beginning of July I did a tour of part of Europe and traveled about 7000 km. For this trip, however, the Bulgarian distributor was polite and sold me the necessary oil and filters. I dare say I treated the bike like a small child. I changed the oil every 3500 km, and my maximum speed has never exceeded 120 km/h. It all sounds good...right-until yesterday. I had planned to cross the Transfagarasan pass in Romania, but even after I crossed the border between Bulgaria and Romania, I heard a strange noise in the rear cylinder. Something like whistling, scraping, grinding...I can't quite place it. It is strange that at idle these sounds are not heard and the engine works extremely quietly and calmly, but when I step on the gas and the revolutions rise to 3000...3500 revolutions, a music starts that is not pleasant to the ears. Maybe I acted irresponsibly, but I continued on my way, hoping that I would get where I was going... and not only that, I even went home to Bulgaria, but this unpleasant noise remained. So....now I'm thinking....maybe a stretched camshaft chain????....but the noise comes from the left side of the motor and the rear cylinder chain is from the right side. Even more noise is heard only in medium revs, and in high revs it starts to die down. And is it possible that the tensioner of the chain has been damaged, or that a valve is rattling. I could take the bike back to Bucharest for warranty service, but it's unlikely they'll Honour my warranty. I'm now 10000kms since the first service which means I've skipped two service visits so.....I guess it'll be a waste of time. I've never been worried about getting my hands dirty and to be honest I've always serviced my bikes myself but this is my first time dealing with this problem so any advice and opinions would be great. Тhank you in advance