I've got some sort of rattle coming from the area of the engine. It doesn't seem to be the engine itself because it is not related to the engine speed, although it does subside after I've been on the bike for a while. (I also just adjusted the valve clearance and the clearance of the rocker shafts.) I don't hear it when I'm not moving, so it is very difficult to diagnose. Sounds like rocks in a tin can.
Any suggestions as to where to look?