Four-cylinder V-2?

[Pixie]

Personally though, I'd be really interested in a production big bang motor. I hate in line 4s (too buzzy, not realistic on the road) and much prefer the better torque delivery of a vee twin. If that were overcome by a proddy big bang, I'd be first in line for a test ride.

The vibration characteristics of a big bang straight 4 are pretty much the same as a non big bang version

[xwhatsit]

The vibration characteristics of a big bang straight 4 are pretty much the same as a non big bang version

Not quite sure what you mean, there? Well, I know what you mean, but would you mind explaining?

[Motu]

It's the same crank,the camshaft is altered to change the firing order....so the vibration stays the same.

[avgas]

To be honest i cant see the point in doing it 'exactly' as you would lose the continous power of the IL4. But yes it is possible - if you have a look (zxr4 as an example), they used to bridge the balance the exhaust by bridging the manifold/headers.
If you want the best of both worlds your choice is a triple with mild cams.
At the end of the day a v twin is going to be a v twin, and a il4 is going to be an il4. If you don't believe me - look at the mechanics of it.
No point in making a busa sound like a tractor.