I'm planning on doing some maintenance on my '04 WR450 in the next few weeks. I'll probably do some riding this winter but it will be pretty minimal. So I figure in the downtime, I should do some work on the blue dragon to keep her in tip-top shape. I bought the bike new in Feb '04 and have changed the oil about every 2-3 rides. I only ride once or twice a month and the bike has a little over 500 miles on it now. I'm a pretty mellow rider so I don't think that anything on the bike is terribly worn. Besides changing the oil, I've tightened the spokes...and that's about it for regular maintenance. I'm planning on doing the following: New spark plug Lube the rear suspension linkage Lube the front and rear hubs Lube the neck Change the coolant Rejet the carb (maybe...I'm not sure I want to delve into this as I don't want to spend lots of time fine tuning it or screw anything up...the stock jetting works ok except for a little hesitation off idle) Any tips on tackling all these projects? I figure I can do it over a couple of weekends and I'm not in any hurry. Is there anything else I should plan on doing? Should I do a valve adjustment? Is that even something a mildly technical person should do on a bike or should I take it to a mechanic for that sort of thing?