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I think Hayden is second in the points standings after three consecutive victories and a fourth at Road Atlanta. The Kawi 636 is competitive with the Suzuki 750 in the AMA Superstock races.



The larger point may be (as you eloquently point out) that most people do not have the skills to ride the Gixxer to it's limit. For lots of riders out there, a 600SS may be a better choice, especially either on the road (where top speed may not be attained by law or prudence) or a track that especially tight like the Streets course.
 

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Re:Correction

Four smaller pistons will *always* be able to make more power then two larger pistions.
You should add: "at the same displacement."

The rules were in place so that the amount of air that an engine can pump per unit time would be close to equal. 750cc Four vs. 1000cc Twin = about the same pumping speed given the differential between maximum piston speeds. As reepicheep sez, it's not favoritism, it's physics.

One other reason for the advantage of the twin is not only the midrange power availablity but also the traction advantage gained by the power pulses of a V-Twin over an I-4.

"The twins also put the power on the ground differently than a four. With most fours, one piston is usually on its power stroke at any given time, so a four will feel smoother but it will also spin the tire easier for that same reason. With a twin, one cylinder fires then the other so you have the effect of turning on the motor then turning it off. The tire will actually start to spin then be off of its power stroke so it will regain traction. This pulsing effect gives the twin an advantage in the traction department. In the Grand Prix two-stroke class a couple of manufacturers produced what was known as a "Big Bang" engine, where all of the cylinders would fire almost simultaneously to give this same traction advantage."

-http://www.boldbikes.com/techie/no99tech.html
 
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