While Buell was recasting the cases stronger they figured they might as well make them fit cylinders with 4.08 bores too, and slip in a 3.125 stoke crank so it could turn 8800. Dont even ask how the dual 62mm thottle bodies or the XR750 appearing heads came to be. The 1338 cc's is a nice advantage over the 600's too except for the third pit stop for fuel that the rest didnt need because it got 18 laps per tank in a 60 lap race. Might be strong on a shorter track but it gives a whole new meaning to stretching the rules. Does this mean its legal at Bonneville?
Buell pulled a Smokey Yunick interpretation of the rules, and more power to them for it. The rest of the competitiors have been doing the same thing for years, they've just been a little more subtle about it. I guess it bugs you about the advantage given to aircooled twins over water cooled Fours and Twins, but I'm not seeing Buell becoming an overdog at this point with the extra displacement. We'll see how Buell actually does as they develop the bike.
WRT to the cylinder heads and the throttle bodies, the AMA wrote the rules: "3.Twin-cylinder air-cooled motorcycles: Engine modifications are unlimited." Buell just took advantage of them.
I'd doubt that it's legal for the M-class at Bonneville, but since the rules are so open (like what defines a racebike? The engine or the frame?) I'm sure that we'll have a few more people pushing the envelope there as well.
