Whenever I ride it in 4 th gear at 6 k rpm there is a grinding like noise coming from the front end of the bike. Something like a metal grinding noise or worn out bearing noise but barely audible in other rpm ranges. In 4 th gear at around 6k rpm it is clearly audible with a lot of vibrations in the handlebar and footpegs. It is not there in other gears.
I went to pbk 3 times to fix this issue so far. Last time they kept it around one week but couldn't fix the problem. When I gave the bike the mech said there might be any loose fairings or nuts. I asked why it is only at 6k rpm in 4 th gear, he said the 4 th gear is the load gear of ninja

My bike clocked 19 k kms so far and the chain sprocket seems clean to me (well maintained with frequent cleaning and lubing with motul, always well lubed even after a rain). If it is the chain then why it only makes the noise at a certain rpm in a certain gear???? If it is not the chain what else would be the culprint??? I am really confused because the noise and vibrations are getting stronger and the warranty is going to end on this Oct 2012. If it is related with engine issues or any serious problmes, I will have a tough time when it is out of warranty.
What will be the problem? Any idea guys???
I have searched on a lot of forums including ninjette and found lot of guys are facing this issue but none seems fixed or the guys didn't updated on the threards.
Found a video on youtube. Yes, I am facing the EXACT same problem.
http://www.youtube.com/watch?v=se2AZvmiEF8
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