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best to get carb rebuilt and jetted by a pro
naw ... rebuilding a Weber 32/36 is so easy, why pay somebody? You may not even need new gaskets, even 20-year old ones are often resuable. Or you can get a "rebuild kit", but I think that's not usually worth it. The most you'd need is the top (float chamber) gasket. Spend your money on the jet kit, which is an assortment of jets, metering tubes, and other parts.
Jetting? Do it yourself. The ones in it will run an A12. Buy the jet kit and tinker with the jetting to get it perfect (or closer to perfect). It's better to learn this than pay somebody.
When buying a used carb, the main thing you gotta look out for is the main throttle shaft. Make sure there is no play side-to-side (wiggle it to see/feel if there is play). It should be tight, and if so it's good. If it's loose, it needs to be drilled and bushings put it.
Rebuild is easy. I've taken to just doing quick clean and inspect. The key is to be careful taking the top off, note where the parts go. Rinse the insides off with carb cleaner. Spray carb cleaner through every passageway to make sure they are clear.
Don't take the throttle plate off the carb. There is almost never a need for that.
Hold it upside down and make sure the float hangs level with the top line. Any Weber book should explain how to adjust the float level by bending the tab if need be.
Test the power valve by using a bit of hose to suck on the right passage. It should pull the power valve down.
Put the top back on. Check the spring on the choke. If it don't have enough spring, by a new electric one. It's just wired to the alternator output (not battery).
Bolt it on and go. More info at
Weber 32/36 Carb page