What kind of main jet should I use.

I have a 2000 YZ426F and our elevation is 4,327. What size of main jet should I run?

Stock will be fine

More important is the FUEL SCREW: you should be an R&D so you can learn how to properly adjust the pilot circuit.

You should also replace the emulsion tube, slide plate, slide plate seal and probably the accelerator pump diaphragm on a carb that old.  That stuff all wears out.

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