Dealing with folks with problems after repeated corrective attempts, I am inclined to perform a wet test, as carbs are delivered, prior to any disassembly...does not eliminate teardown and the usual intense service...but the extra effort in testing can be revealing.
Here's a pic of a runaway float valve, EX500 carbs as received...(witness the way high fuel level, right up to the vent!) diagnosed minutes after unpacking. Provided the owner with an answer (and visible proof) as to why his leaking out the vent hose, extreme flooding condition.
Of course, successful service then went forward.
And re: shop rates...dealerships charge labor per hour, period. I don't think they'd be too receptive to bargaining. Dealers closely monitor that hourly labor.... and some choose to PAY their techs based on those hours, too.
I'd advise to call the service manager, discuss their hourly rate and get an estimate on time required to do an "on the bike" carb R and R, clean and setup. So you know going in...no surprises.
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