TOPIC:

Sometimes my bike leaks oil from one of metal rings that holds my exhuast on. Is there a gasket in there that could need replacing or is it somthing else?

check valvecover gasket or tach drive.goodluck,happy wrenching!

Are You SURE that You have oil leaking from the EXHAUST?
Are You burning any blue out the pipe?
I think Wireman is on the right track.It could be oil leaking from the valve-cover,or like it happens so often...the tach-drive seal.They dry out(like all seals)over time and if the leak is left for a long period of time,the oil will leave it's mark all OVER the motor...same as the valve cover.
Get the engine cleaned off good with a degreaser...wipe it down(after a rinse) and go for a ride...a good long ride.Let it get up to temp and then some.Get it home and have a good look and let Us know what You see.

It does smoke a little. I can see oil drip from where the exhaust pipe goes into the engine. I took it apart and the 2 metal spacers looked fine but I didn't know how to check the gasket. I'm going to check out the tach cable to.

Sounds like a tach drive seal to me.
Is the oil dripping from the # 3 (third from the left, as you sit on the bike) collar? The tach drive sit just above that pipe.