It looks like a special engine. Wasn't that one used for hillgliming UK Style??
I've been reading the test now, it makes me yelous and want to have it!!
I'm planning to buy a RMZ450 08 or 09 for the costs over racing a 500.
In holland you can't find a good K5, and buying a old engine for rebuilding and putting it in a 250/450 frame
just costs to much for me
but a man has to have dream in his live
Dutchie