hey people... i'm not sure if it's anything to be stressing about, but when cold, on idle, my CBR sounds (too an ex car mechanics ear) to be pinging/knocking a tad :\ just a soft metallic knocking in rythm to the rpm. doesn't get any louder or faster when i rev it, i'm guessing because the exhaust drones over it, or it evens out. and i'm 60% sure it goes away when it's hot (will check today after a ride). the fuel in it was put in by loz, and he concured he used the right fuel with the mechanic when they were randomly talking about it. so, i doubt it's the fuel. might be nothing, might be something..