Laid my bike down on the right side. Reason! Some wonderful person pulled a left hand turn in front of me at an intersection. Chose to it down instead of T-boning them. A little sore but that was about it. The problem resulting is a noise. Cannot pinpoint it. Sounds like it is coming from the engine or the tranny. I've had a few friends who know a little about bikes listen, but know one can say where it is coming from. The noise appears a few minutes after starting the bike. You really hear it at about 1800rpms. Can't hear it at low idle or high idle, not moving or moving. The bike rides fine. No hesitation, goes through the gears fine, no backfire, nothing. Just a knocking sound. Metal on metal? Would anyone have any ideas. Did not have this noise before the bike went down!