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'99 yz 400f carburetor issues

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Hello everyone, as stated above I have a 1999 yz 400f that I recently bought. I have read a lot of forums about this bike and its carburetor problems and found out that other people have switched their stock carb out for a newer yz carburetor. Would it be possible to use a 2004 yz 450f carb. If not could you guys give me some tips on how to fix my slow throttle response?

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Basics first.

Disable acc pump and set pilot circuit as per Williams instructions in wr stickies.

Adjust needle next.

Adjust main.

Reset acc pump and adjust stroke/squirt.

Should be good.

No quick fix. You need to be methodical and it will pay off.

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