I agree with John, not a big deal a tad rich, thats mostly were your getting the black from possably a little oil fouling, one problem I and it would seem several others is the O2 sensor on most data loggers go somewhere in the middle of the dump pipe and when your at anything but full boost it gives screwed readings because its not far from the pipes open end, at slow speeds the reading shows leaner than really is cause the sensor is so close to the open air, the really pro dyno guys know ways around this and of course thats what they get the big bucks for, the plenum you have does make changeing plugs a real PITA, but being old school myself and not putting complete faith in the data logger, I put my tools and spare plugs, small laptop, in a small backpack and hit the interstate and make a couple of short boosted hits and then a easy run, so I'm sure the plugs are not to hot or to cold and fouling, I will do this whenever I make any change in the fuel system, map, lines, rail, pump, like you said it is a pain and even if it takes a couple hours, your pretty sure your when your done your not fouling or melting plugs, valves or pistons,....I do have access to a dyno, but its older than me and has not setup to read A/F, and the dude it belongs to don't really like to run my bike on it, as its two or three times the bike its used to
