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You didn't say specifically what's wrong with the way it runs that makes you think the mixture is off, but my BIG bit of advice is not to assume it's the mixture or even the carb. This is a classic mistake I've done myself about a zillion times: the car runs crummy so I twiddle the carb, and it doesn't help, and later I find out the problem was actually a fouled plug or the timing was off or I forgot to reconnect a vacuum hose or something like that. So, check out the other basic tuneup specs and make sure they're OK before you start tweaking the carb.
Next tip: You say you've rebuilt the carb -- any chance something went wrong? I ask this because I know the hard way that it doesn't take a very big speck of goo to clog a jet in a Weber. And when putting it back on it's fairly easy to forget something and cause a vacuum leak, which throws off the mixture without having anything to do with the carb (the extra air leaking in makes the mix go lean.)
Once you're sure everything else is OK, tweaking the mixture shouldn't affect anything other than making minor improvements in how the car runs. Example: if it runs basically OK except that it 'surges' a bit when cruising on the highway, you might want to try going 5 or 10 larger on the main jet to make it a bit richer. If it runs fine but the tailpipe is black and sooty and the gas mileage isn't great, you might want to try going 5 smaller on the jet. That's all I've ever done on a Weber; experts can do more (changing other jets, emulsion tube, etc.) but usually you only need to make those adjustments if you've done big performance mods to the engine. In which case you'll want to invest in Jack's book and maybe the HPBooks 'Weber Carburetor Manual' too.
posted by 68.13.13...
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