They're run in some of the Junior Motocross classes in NZ. And that it what the bike was designed for - introduction to off-road sport/competition riding. But it is a moot point really, as it is the SAME engine in the DR, DF, GN, GS, GZ non-competition bikes. So, it isn't a competition derived engine as far as I can see, but it is used in a bike designed for competition!
Cheers,
FM
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