YZ 400 Trouble/YZ426

So I'm having some difficulty starting up my '98 YZ 400. Its definitely carb problems, so I tried putting on an '02 YZ 426 carb. I can kick it to where it fires up, but then dies right away. Any suggestions?

I am going to play around with the air mixture screw on the bottom

Vacuum leak at the Octopus fitting on the cylinder head? plug it.

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