I have the new 34 MM Mikuni's mounted on the 650 Triumph. I tried a total intake length from the carb intake to valve of 13 inches....No good, The large TM carbs foul the inside of the rider's knees. The rider has to get his knees out of the wind and being tucked in gives the rider a secure feeling at 120 plus MPH
I was using the same intake length with the 32 MM Concentrics....But shorter intake, and a 3 inch non tapered velocity stack cleared the rider's legs. The bike was competitive set up this way....The Concentrics are crude but very forgiving about intake length and stacks...
Ok,I have no experience with Mikuni's and how they react to velocity stacks...
Anyone have any experience? The bike is going on the dyno next month ...I have jets, different length intakes...But need to get this velocity stack business figured out...And like everything else, I'll have to fabricate the stacks in my little shop of horrors...

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79 T140D, 96 900M Ducati ....On a bike you can out run the demons..