A PZ30 is a 30mm Keihin clone. I don't understand the Keihin sizing, but my guess would be that a 42 slow jet and a 110 main would do the trick. The problem I've encountered has been finding replacement slow jets for the Keihin clones.
Enter the 30mm Mikuni. You can get one for $40 including shipping, and jets are easily found at your local Yamaha dealer.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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