I used part of a Quadrajet linkage on a Briggs mini that I built about 10 years ago, along with the Quadrajet return spring. While that worked relatively well, if I had it to do over again, I'd buy or fabricate an intake tube that would accept a conventional motorcycle carb. Since you're dealing with a 212cc mill, I suspect that a 30mm Mikuni (which I believe to actually be 26mm) would work well. It's cheap enough to try.
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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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