Rattling cat!

Hi Guys

I was out for a ride on Sunday there on the Cat. Heading home after around 250 miles, I was overtaking a few cars in second gear and got round to around 12500rpm as I pulled in and changed up. Since then my Cat has been giving a metallic noise from 5k rpm up until the revs make it inaudible.

This noise is a metallic scratching noise, almost like a chain being dragged over metal. It only shows under light acceleration in all gears, closed throttle at 5k rpm+ gives no noise. If i knock it into neutral and continue coasting at the same speed with the clutch out, it is not present. Standing still and revving in neutral I can't hear it either. I put it on the rear paddock stand and ran it through the gears, again not auditble. Its now driving me bonkers as I can't locate it...

So far i've had all the fairing off, checked the exhaust bolts, looked for anything visible that could shake. I also looked at my chain which was rather loose and tightened it up, cleaned and lubed also (it now looks like new!).

Tonight I tried to get the noise to show up when stationary. I pulled the brakes on tight, reved to 5k and let out the clutch a little to put load on the engine and the noise showed up. So it seems its when the engine is under slight load in any gear but when the wheels etc are not in motion. So im worrying now that I have an engine problem.

Im really stumped here, can anyone give me any pointers? I've scouted the forums here and so far my list extends to the Windscreen and Cam Chain Tensioner then the threads normally go dead...

Thanks J

I'd look at the tensioner first - sounds a bit like sloppy valves.
Possibly something in the clutch? Worn basket?

Would a loose tensioner make the valves sloppy or do you think that it may need to be reshimed?

Ill take a look under the clutch cover next too

Thanks for the reply!