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Just wanted to know regarding my 04 R1 about reaching between 6-7000 RPM while cruising it seems the engine sounding like different. More like a humming sound. And the RPM needle moves up and down while cruising, isn't suppose to be steady? Any idea about this? Thanks in advance.

Before I start I just wanted to say thanks in advance. My 04 R1 seems to loose power when on 6th gear. I'm on 9500RPM 132klixx. I thought it's was the spark plugs at first. Changed it and same problem. Put some injectors and fuel lines cleaner still same. I did some research on R1 forum and so...