Inliners International Forums General Discussion Engines Running lean on #5 cylinder?

Ok, I did some more probing. I've found that the a couple of the exhaust valves have a red residue like rust on them-#5 is the worst and #2 is next.

This is a picture of #4-5 exhaust valves


This is a picture of #2-3 exhaust valves


#1 & 6 exhaust valves are black with virtually no rust residue on them. #5 is the most "rusty". Also, as can possibly be seen in the photos #5 has the least carbon buildup.

What does the rusty residue mean? Does it spread anymore light on the previous pictures? Thanks for all the help guys.