That is an excellent suggestion. My memory is not what it once was, but that reminds me: Alternatively, if you remove the air filter[s] and run the motor, you can rev it up a bit and quickly cup your hand over the air intake for each carb, one at a time. Listen for the motor to bog, and remove your hand. This will cause vacuum to rapidly suck most of the gas from the bowl and really swirling things around in there. All the fuel has to go rapidly through the valve, so it could knock the crud on through. Used to work with single barrel automotive carbs, too. Instant tuneup!
Note: If you leave the intake covered too long, you could also just flood that cylinder, so not too long. ALso, use a rag, not just your hand. That much fuel and you could backfire that cyl, which hurts like hell.