everything is exactly the same on yours compared to the older ones except for 04-05. The only 2 item that is annoying is your fuel screw is d shaped and not really adjustable (change it and chuck it) and your needle isnt adjustable.
HRC kit is hard to find these days. But in reality all you need is jets from 160-170 in increments of 2, a needle from a YFZ NCVQ and a 55 leak jet. You will want to replace the fuel screw either with one from an older 450 (pre 08) or just get an adjustable one. Then a nice hotcam stage 2 and throw away the airbox lid. Voila done.
Course that full exhaust helps. HMF, Dasa, CT, Monster are good pipes, dont buy cheap crap.
-2004 450R. Far From Stock.. Sold, crank was going
-2006 450R. New WHIP..
-Do it right the first time, and you wont have a problem later. Being cheap or taking the easy way out only makes matters worse later.
-Your Backyard Mechanic Extraordinaire: Responsible for bringing you redneck, ingenious and often interesting ways how to fix things.
-You can watch things happen, you can make things happen, or you can wonder what the H*ll happened. Captain Phil Harris