Another way to think of it is...
If you take 900cc and divide it by 4 keeping the stroke the same. Then take 900 cc and divide it by 3, keeping the stroke the same, the diameter of the piston becomes larger.
The 3 cylinder now has the same stroke but the power is made by a larger piston at 120 degree intervals instead of the standard inline 4 producing power at 180 degree intervals. This increases torque and you may loose some power band at the upper rpms but your larger torque has done it's job at the lower end already. It's really how and when you're using your power.
My SV1000s V-twin is so much fun right out of the gate and because it's a short stroke twin it has a wide power band and higher redline.
Yamaha's triple will be a great engine! :rockon: