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Hi all,
After a ride in a lot of single track, my engine started to make a weird sound.... as the RPM goes down it always make the same 3 knock knock knock just before it get back to idle.
I never heard this sound before...
Piston or "kips sound" ??

Thank you!!!

Ok, so this morning I get the bike out, warm it up and made this short video

At 0:09 you can hear the knocking sound I'm worried about...
I didn't hear it when engine was cold...

http://vimeo.com/14336546

Hard to tell by the video. The best thing you can do is pull the top end and see what you can find before it is too late.

Piston have a lot of carbon on top, kips valves also have a lot of carbon, I cleaned them on 2008-2009 winter, the type of deposite on valves are weird I'll take a picture of it...

Should I try the right side of the engine ? I removed the clutch cover to see the autoclutch, everything was ok...

Ok, I found it !!

thanks Griffbones for you're reply.

Here is what I believe is the problem.
http://vimeo.com/14393098

Yep that bearing is shot!