Well, first off it should idle at 1400 rpm. That should help a little.
The cam chain tensioners do go bad and make a terrible noise, usually at low rpm, cold engine startup and then when the engine gets very hot. They are about $80 each and are easy to change. If raising the rpm helps but doesn't get rid of the noise, then new cam chain tensioners will probably fix it. It fixed my early 05 model. Later CCT's were made better.
There is also a torque adder loose bit on the clutch, but it usually doesn't make much noise. Noise is while under way.
There is also a clutch on the starter motor that makes a horrible noise, but only on starting. The early 04 models did not have this.
Lots of discussion about this.
"Dad, can I get a motorcycle when I grow up?"
"Son, you can't do both"