My dad bought a 09 wr450 last january new and it seemed to be running fine stock, definately fine for him at least. I felt it was a little lean but it would idle fine. Fast forward to today the thing will not idle without the choke, once you get the rpm's up it runs fine but as soon as you slow down it will just die. I had no problems jetting my 09 yz and adjusting the fuel screw but the WR is so crowded under the carb I cant even reach the fuel screw, and the manual doesnt even show that it has one like my yz manual. He said I could go ahead and buy whatever I need to fix it so he can ride and I was planning on doing the ais kit, fuel screw, throttle stop, grey wire, snorkel removal, and maybe going up one pilot, main and clip position on the needle(if I can't fix it with the fuel screw). Basically Im just wondering if the sudden change in how the bike is running is due to bad stock jetting or something else. Also, is there anything I need to be looking out for thats dramatically different than my yz? It looks like im going to have to take off the carb to do any of this stuff because the wr has wires and hoses everywhere, the bike is already annoying me lol.