While this was very helpful, it was for an 07 WR250, and I think it can be done a bit more easily. The rear subframe does not have to be removed to access the carb, at least I didn't do it. Can't recall if I removed the tank or not, but you do have to remove the seat, if you can't see the top of the carb then you'll have to remove the tank. You are going to have to loosen carb clamps front and rear, I found it necessary to removed the carb cables because I did the o-ring mod to the accelerator linkage, with the JD kit you get two O rings, heavier and lighter to tailor the pump stream. If you remove the cables at the throttle tube you might be farther ahead. In any case you'll have to pull the carb lid and then get down to the slide. I rotated the throttle with cables still attached and fixed it in position so the slide was more accessible, the center allen/hex screw can then be removed and needle accessed. needle nose or grease on screwdriver tip so permit you to remove it. Replace it with one from JD kit or GYT kit, bolt stuff back up. You can access the float bowl
with cables loosened or removed by tilting the entire carb to the right, bottom left. The bowl can be removed, pipcs show allens, but I'm' almost sure screws are phillips/cross, although good idea to replace them. Cap over the fuel screw can be popped out with an o-ring pic, and its a good idea to replace it with aftermarket adjuster, something with an index wheel
or one that has a cable on it. Pilot jet, and main jet can be replaced, make sure you don't lose the spring an o-ring under the pilot jet. Replace the leak jet
in the float bowl and button her back up, rotate carb tighten clamps, reconnect cables, replace seat/tank and you should be good to go.
The GYT kit does have the plugs if you want to pitch the AIS and the YZ throttle stop, but that's available separately or you could simply cut down the one you have, JD kit only the proper jets and needles. As far as the exhaust
and air box, just like the pics describe. Good Luck.