Ok, I'm an ex dez racer. I've posted a few questions on the forum that have had great replies. I've got a new one. I took the ol girl out on her very first desert run in one of my old haunts. I flogged her pretty hard and she did not overheat, however every time I would hit a big bad whoop section the bike would bog on the G outs, (this sucks when you twist the trottle and need it but nothing happens, except you hit the next whoop with no power and loose your rythm.)Another thing I noticed is the engine does seem to be a bit noisy. I can hear a faint clatter or light rattle. I dont think it is detonation but it could be. I put the highest Octane I can get in it. Anyone have any clues??? and yes I've adjusted the valves. Again this is my first four stroke maybe some of these noises are normal. Thanks in advance. Mark.