As a red blooded american veteran who loves his Japanese machinery I am not going to touch this one with a ten foot pole, but to clarify what exactly I am not touching: AMA superbike, NHRA pro stock bike, and now this class where we have at least a fifty year head start.
Well ,where are all the obligatory comments deriding Yamaha, a manufacturer of obsolete air-colled pushrod bikes? Oh wait. Air cooled pushrod engines are not an outrage if they are produced by the Japanese.
'Might be a bit of (big) manufacturers' "political" influence involved here.. but then again, maybe not... It seems the rules were "clarified" periodically (or at least I was given to understand so...).
I know of a (privateer)Confederate Hellcat that was not allowed to play (113"/1857cc evo was standard - but the rules committee? disallowed a de-stroked version @100"/1640cc); and, the bike was too light @497# dry... the 155# pilot would have to add 100# of plate-weight to meet the weigth minimum. I can't help but think it might have been interesting.