1978 GS550 isssue

[Jesse002100]

well with the help of most i have my gs550 running great so great i decided to go to the race track and have it out with it but on the way to the track a guy pulled up next to me on a newer gs500f and we decided to race, but anyway after beating him i started to hear a weird sound from them motor. someone told me it could be something related to the cams??? but im not sure all i know is that a idle its pretty loud but the bike runs great, after you start to raise the rpms it goes away then comes back. the sound is kinda like a knocking but it doesnt affect anything for running so it cannot be to critical i think, i thought id just ask the best forum that has made my bike run basically from the start.
Thanks in advanced, Jesse

[AOD]

How high did you rev it while racing the GS500? What oil did you have in it?

The valve train on a GS can be noisy, but it's usually a rattle/clicketty-clack type noise, not a knocking. Knocking usually means a crankshaft, rod, or other bearing...

[Nessism]

If the noise is only heard at idle, and sounds like a shuffling-knock, it could be the clutch hub nut has come loose or the hub itself is developing play at the springs or rivets. One other maybe is the cam chain tensioner needs to be serviced. You are going to have to get more specific in terms of where the noise is coming from before attacking the problem.

[Jesse002100]

im going to make i video and put a link to it here i cannot explain it very well so give me a few and ill have it for you guys thanks for the ideas so far

[Jesse002100]

the video was just upped so it may be 10 15 minutes till youtube has it ready

http://www.youtube.com/watch?v=uVlhSJljy_Y

i hope this helps i just hope is it easily fixed i have a 100 mile bike run in cleveland on sunday would love to ride the gs than a 150cc scooter LOL but in any event it will be nice