Originally Posted by The other Ferret
I dont think anyone would have complained about a little more capacity, however one of the design criteria is that the rider be able to see the two outside cylinders while sitting on the bike. This was important to the designer (probably more than it would be to potential owners, but not our call ). This determined the width. The front of the seat and back of the steering stem determine the length, the top of the motor borders the bottom, so the only place to get any additional capacity is in height. Make it too tall and it loses perspective. Personally Id have rather had it a little wider, but I can live with it..or I will live with it.
I hadn't thought about why the width was designed as it was, but that makes sense.