I have raced a 2006 WR450, for like, forever. All sorts of things, mx (am not too good at), GPs, Idaho City ISDE qualifier, 24hrs (even Ironman), etc...on and on, lots of races, rides, torture...and other than the WEIGHT and I had to replace the starter, I love the bike! Jetted it right from day one (GYTR powerup kit...just flat worked.) I am a weenie, 175lbs, race 40A and am pretty competitive in this class and on the WR...until the wife got tired of my moaning about its weight and bought me a new leftover 2009 YZ450 that is, in a word, awesome! Racing it is a blast, suspension is unbelievable, and i am smitten big time. I have set it up for off road (armor, tank, etc.) However..I do a LOT of dead engine start races and am having trouble getting the jetting right. I messed with lower pilots, quite a few "cheap and sensible" things (fooling with needle, pilot, fuel screw.) Right now, am back to stock everything, have Tusk adj fuel screw, but have a 48 pilot in (which HAS helped!) I run a Lexx Rocky Mountain pipe which tested 94.5 at Big Sky XC so am happy with that. I am getting great fuel mileage from it and plug is looking right, nice and tan. Bike runs almost too good...just not what i would call an easy/fast starter. WR starts hot or cold just flat easy...kick or button. The YZ "starts" but not "in a hurry"...prefers to be in neutral. Have about 15hrs on it? Mostly fast trail riding and races. Live in Helena, MT elev ranges 3k-8k on riding locations. (Elevation here is 4k) Have heard awesome things from friends that I race with that run this bike, and all are saying "what took you so long?" Most are running just stock jetting and their bikes start "fine." Any directions or suggestions are appreciated! Also, any articles/suggestions on making this bike last and be as reliable as Ms WR450 are appreciated too. Thanks in advance!