I have measured the throat of the Keihin D64A carbs on the VT500 [28.8mm x 32.6mm] which would be equivelant to a 30.8mm diameter throat. This should be better than the 34mm on the Suzuki GS500, and its almost the same as the Kawasaki Ninja 250 [30mm].
The Yamaha V-star 650 has 28mm carbs. which could be adapted to a Vision if they are smaller.
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