I currently ride an '04 KTM 300 EXC two stroke. It's great but I want a four stroke. I keep looking at the KTM 450 E (4-stk) and would get one in an instant but they seem to require allot of maintenance like checking the valves every 15 hours. When we do a weekend ride I can put that much time on a bike, or more. Do the WR's require the same amount of valve checks as the KTM? How about maintenance in general, do the Yamaha's need much? I don't have any problem with the simple stuff, oil changes, air filters, ect. I'm just not enthusiastic about having to pull the tank and radiators off every two weeks to check valves. How about the weight of the WR, seems like magazines always say they are to heavy, are they right? Any tips or suggestions?