Just lookin about there are some great WR450Fs out there to be had and the lure of an electric start is becoming greater, especially stalling up a slippy incline. The XR4 is just a great bike and maintenance is easy, is a WR just as easy. How often to valve checks?? Whats the bike like for tarmac riding as I sometimes do 70/80 miles to get to rocky trails in mid Wales where I love to ride. The XR sits superbly at 55/60 mph on 15 45 sprockets and pulls well enough off road as well. Is the WR in the same league or better??