I have a 2001 WR426 that I YZ-timed, loved the bike in that timing. I consider exchanging it for a newer 450 one (2004) by the way when will the 2004 bike be available in the stores? I rode last week a stock WR450F 2003 of a friend of mine and the bike is far less responsive and powerful than mine. 85% of the power mine has I would say. I don't know if that's because its stock (grey wire in place WR timed and just had an opened muffler) or not. Anyway, cutting the wire and putting a WB pipe will help, yet my question is can the 450 be as easily set to YZ power as the 426? (just chaninging exhaust timing one dent and adjust jetting?). I am afraid I won't get a new WR450 as nice as mine WR426-yz timed, or is this nonsense? I read somewhere that the 450s YZ has actually a different command-rod (what's the appropriate name for the rod that pushes the valves again?). If I want at least the same power character as my 426 has now, do I need to change the expensive command rod? Please help.