what does this mean?

[pandymai]

i got my exhaust on last night and i ran the bike so far for a total of about 1o minutes. the right exhaust header has already discolored a lot compared to the left. both seem to be firing though because both get hot, this just seems to get much hotter?

carbs looked to flutter around the same time and height and the jets are the same for both. turns out should be the same too. bike responds well and sounds good

should i be worried about the quick discoloration of one side?

[black and silver twin]

probobly need to do carb sync or valve shim adjustment, both could cause one cylinder to run hotter than the other.

[Homer]

Psshhh, I wouldn't touch it.  You just got it back together!
My Versys is doing the same thing, fuel injected.  
Same side, even.  Maybe a little further down.  
It's just the nickel in the alloy being tempered.  I think it's pretty, personally.  

It's not all the way around, just on the bend.  Just a few degrees hotter than the other, no biggie.  
Heck, it could be an old coil wire, an un-optimally degreed plug (right hand twist, after all), Mars aligned with Jupiter.. who knows.  

Edit:
If it grows after a long ride, then you're lean.  But, they can take it.  Look at that kid with the orange frame, for instance. 
His had 8 inches of f-ing ASH on BOTH sides. 

[Ton]

Running for such a short period of time I wouldn't worry...But exhaust gas temperatures (egt) are supposed to be the roughly same, I really don't know what kind of problems you'll run into if the EGT very by more than 50 deg. F, I've been told by some amature engine tunners that different egt's can cause engine failure.  They were fooling around  with intake designs and individual cylinder trims, trying to make up for the non-symmetric ariflow due to there intake designs-tunning for wide open throttle. 

Tony     

P.S. I used to work for a guy that would douse the engine headers with oil, so they would have that rainbow look once it burned off.