I would make sure your cam timing is set for yz specs and not wr specs.
On the jetting I would go with the 48 pilot, that should get your fuel screw back down to the 1-3 turns out area. If you have it jetted good but still have a bog when you wack the throttle I would change your leak down jet. Remember this is the opposite of what you would normally think of on jetting. If you want it to shoot more fuel you have to install a smaller jet and if you want it to shoot less fuel you install a larger jet.
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