how often do you have to check the valves on a WR450F? I'm looking for a bike that I can commute 3 miles each way on sunny days and ride in the mountains of colorado on the weekends. My choices are really between a WR450F and a KTM 625 SXC. I know that the sxc is more meant for that kind of duty, but I've always been a WR fan. I'm sure that the WR is a much better offroader too. I'm just afraid that I'm going to have to do a lot more maintenance on the WR since it's not meant to be a road machine as much. I was also looking to find a hp rating on the 450 and couldn't. Does anyone know? Anyone?