This just started a couple weeks back. I get this knocking noise on cold start-up. It only does it when it sits a couple hours then start it again. After its warm and Im off riding it quiets down almost all the way, if not completely. Its pretty loud and kinda scares me. The sound pretty much came from nowhere. It sounded normal one day then noisy the next. Ive read numerous posts on noises. Might go ahead and replace the CCT just for kicks. The bike has almost 28,000 miles on it. I wrecked the bike back in Nov 07. Put 6,000 miles since then. After the wreck it sat for a couple months and it sounded like more noises were around than before the wreck. It might just be a paranoia thing. Anyhow if you have any suggestions I would greatly appreciate it as I am going to my first track day at Putnam on Oct 19th. I might just wait till after then to start tearing into it so I dont screw something up. Thats how my luck goes...