Hello everyone, I am considering buying Yamahas WR 450Fs, I run a tour business in southern europe. I have 1 major concern with the Yamahas: valve wear. I have been reading through all valve related Qs and it seems that the Yams are very reliable in this respect. But what about riding in a very hot & dusty (not sand) environment? The titanium valves don't come cheap I guess and I don't want to spend too much time and money on it. My experience with KTM & Husabergs is that the intake valve wear is/can be excessive. Normally I don't bother to check the exhausts, when they become too loud I adjust them. The good thing is: the KTM valves are cheap.. My idea on the subject: if you run your bike only in dry conditions you would be better of with paper airfilters versus oiled foam filters. Any input is highly appreciated.