There's been a few threads about those on WERA over the last year or two. To do those things right takes a substantial invenstment and those newer 450 4-stroke mx motors tend to need a lot of attention b/c they werent' really made to go at WOT for a long time like roadracing bikes do.
Don't get me wrong, its a wicked concept, but from the sounds of it, a 2 stroke 250 is actually a lot easier to buy & maintain.
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