Pavel

Tank you! I can get Yamalube, which is certified JASO MA. It is recommended by Manual. I'll see whether it can improve the situation.

Thank you everyone who stayed care to my question. I understood the following: 1. Noise is not common 2. Shift to the 5th at 60+ mph 3. Use non-synthetic oil I'll try these things that you guys advised and feedback here once have any results. Unfortunately, that'll be not very soon, because winter has come to Russia And a few month we can't ride Only upgrading bikes. P.S. Please excuse me for my English

Usually I shift at much lower speed. Around 70-80 kmh (45mph). But I do not accelerate aggressively at low RPM's

Difference in sound is definite. I changed oil once bought. Now I have synthetic oil in it. Which one would you suggest? Mineral or synthetic?

Hello! I bought RSV recently (2006, around 6k miles on it, the previous owner almost didn't ride it). It is perfect in everything But When I shift to 5th gear, sound from somwhere under changes a bit. It is not loud, it is not whining, but it is another than on other gears and a little bit louder. So is it common or not for this bike? What would you suggest to check? Thanks!