Pilot Air Jet...Pilot Air Screw?

First off,what is the stock PAJ in the 04 WR450? I will be trying out a 45 pilot jet for my bike...will the stock PAJ work fine? Also, what in the heck is the Pilot Air Screw and Spring that Sudco offers? Is this some sort of adjustable pilot air jet or a seperate part?

Thanks,

Mike

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