Regarding AMA superbike, The rules use to be 750I4's vs 1000V2's, as you can make more power with 4 cylinders rather than 2. I think the best thing DMG/AMA did was make plans to adopt FIM superbike rules. Now I think they switched the rules in a rather poor fashion, But the new rules should get much better manufacturer support because they only have to worry about constructing one version of their race bike, not two.
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