Re: banning the 250 4stoke?
The 250F racing in 125 classes has NOTHING to do with the EPA. Obviously (other than direct injection) four strokes will run much cleaner than two strokes. The AMA banning the 250F from racing in the 125 class, would have nothing to do with it's emissions, it would be because of a perceived inequity in the performance, between a modern 250 4-Stroke and a 125 2-Stroke.