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So I've got the bike in pieces scattered about and for some reason I decided I wanted to look down the TB's at the valves. Cracked the secondary flies open and then the primaries to see some nice carbon built up on the valves. Here's the strange part, on the #1 cylinder, the left valve has carbon on it. The right valve is clean, no visible carbon at all. The #4 cylinder is almost like that, one dirty and the other mostly clean. Of course the right valve in the #1 cylinder is close to cylinder #2 (hotter)...but #2 and 3, valves are full of carbon.
Any idea why that is? Is that by chance an indication some shims need to be changed?