That I love my bike!! I've had the valves checked a few times and several leak down tests. In the 2 years I've had it and rode the piss out of it, I finally had to get ONE shim put in. The guy who had it before me said he never had to adjust either. I love this bike. I'd love an '07, but till I get that, this one seems to be working out great (knocks on wood).