My bike also runs richer on the right than the left, though judging by the performance, not enough to worry a lot about. I don't get any feeling from the engine that it's running very rich anywhere in the rev range and it doesn't sound like you were feeling anything amiss before the dyno run.
My plan was basically to get each carb at its best lean idle by ear, balance them, and after thrux351's timely reminder, I'll check my float levels as well
I'll then clean the plugs, swap 'em over, and run her for a while before checking them again. I just got rid of the stock paper filter for a Uni and I don't know what effect, if any, this will have on the imbalance. None, probably, but we'll see.
If the plugs still show the right side running rich, I'll take out the NH baffles I have in my togas. They don't make a lot of difference to the air flow, but they're a variable as they are wrapped in loft insulation and so one might be having more of an effect than the other. Other than this, I'll leave it until winter and overhaul the carbs while the bike is off the road. I've probably sinned enough this year that I should do that as a pennance anyway
After that? Dunno - check the coils, plug leads etc etc. It'll keep me busy when the roads are icy
Hope you figure out what's causing your issue.
