Keep in mind Suzuki makes an 1800 V-twin, Yamaha does, Honda, H-D. H-D's is air cooled. Kawasaki, king of one-upsmanship, makes a 2052cc Vulcan V-twin.

Sez here on Wiki the Yamaha XV-1900 is a fairly high compresssion (9.5 to 1) stroker at 100mm bore x 118mm stroke. Dave is correct, the power curve changes as cylinder displacement increases: torque goes up, red line comes down. That Yamaha engine makes max hp at 4500rpm, max torque at 4100. I reckon it's done at 5K. You gear the transmission to exploit the dynamics of the engine.

Our Super Savage is gonna lope along at about 2250rpm at 70 all day in 5th gear, ready to lurch upward toward its torque peak with a twist... }8^D

I saw a really cool motorcycle last night....and it may be the only one in the US as the bike was not imported into the US I am told.  The original owner as in the military in Canada and bought the bike, then moved to the US and brought the bike with him.  He later sold it to a fellow that lives in the Cincinnati area.

A Yamaha MT 01.

http://www.motorcyclespecs.co.za/model/yamaha/yamaha_mt-01%2008.htm

I'm sure it could work Sonny, but I don't think it'd be near as smooth as an 800 v twin, and not sure it'd be competitive with same
maybe I'm too jaded by past experience with a Norton  
Maybe I'm just addled by that near 100 mile ride atn 60-80 mph todat
i deff need to use the XS 11 on those types of rides

Drive train power pulses are a limiting factor, I would think.

Fat Leb: Person of Lebanese descent, often involved in criminal acivitites or used car sales, with questionable taste and a proclivity to vulgar shows of affluence whether real or imagined.
OCC Chopper: Orange County Choppers. Bikes that appeal to tasteless wogs.

Everything is getting a shove or a tug 500 times per minute at 1,000 RPM.
INCREASE THE piston size, and stroke, and that power pulse gets stronger, damped by the flywheel,
I was looking at small tractors. I called a mechanic and asked him what to stay away from. He said the two cylinder stufeats drive operated tools, like the u joints and gear box of a brush hog. More cylinders, smoother. One BIGGO piston, and you're gonna get some Biggo changes in the powertrain.
Remember the recent belt break?

Id have a look at the hub and the torque soaking rubbers.

Well, Vers, that is clear and hard to argue with. We *like* the pulsing, but just enough to be soulful and within reasonable engineering limits.

Even at 650cc, the Savage will tear itself up if you have the bad habit of lugging it.

I guess the audience for my Super Savage 800 keeps shrinking... now down to guys over 6 feet, who like heavy counterbalanced flywheels, don't care about burn-outs and redlines, just like to ride around being civil while making a low boomboomboom sound. The Suzuki marketing department would count up that demographic and say, no, not worth it, not enough of 'em...

Okay, where were we? How about a Savage with a 650cc vertically mounted air cooled V-12 with 52cc cylinders and no flywheel? The Savage Screamer.

The Suzuki marketing department will now open their desk drawers, grab their Samurai swords and come over the desk at me en masse... help me, guys!  }8^O