A bystander video just showed up:
I don't know how the undercover 4 stroke trolls among us feel, but I'm looking at the speed of the 2 different bike types going up this big hill and the 125 with pipe and reed cage looks just as fast as the factory and professional team prepped, 100% advantage handicapped, fuel injected, 250 foopers.
4 Stroke trolls might be able to make a case for this is the video was shot on a tight s curve or something "Where the slower but lighter 2 stroke has an unfair advantage"... but this wide open uphill??? Seems to me that even a totally unskilled rider could do a decent job nailing the throttle up this hill. Situations like this where the terrain isn't acutely challenging are where the power of the BIKES show through with less input from rider skill.
And I see the half sized two stroke shooting up the hill just as fast as the foopers... So I'm not convinced that they are so much faster. Oh there's also the fact that the two stroke wasn't given a head start as far as I know, and all these riders are in the same racing class, and the 125 is like 1/2 a minute out in front...
I know undercover 4 stroke trolls don't agree, and I know that those who are passionate about getting equal displacement almost come off more like 4 stroke trolls than 2 stroke fans - because of the way they constantly talk down about 2 strokes and favorably about foopers, in order to try to justify their equal displacement desires.
But I know the 4 strokes don't look any faster in this fan video even though they have advantage after advantage piled up like cow patties.