carbs do not need to be broken in.... I hope the guy that said that didn't do the rebuild.. because he's certainly no mechanic... check to see if the idle circuit is fixed or adjustable.... if it's adjustable, turn each screw counter clock wise 1/8 of a turn ( rich) and your idle issues will most likely go away( I'm avoiding the entire procedure here on how to properly set up a carb)... other wise you'll need a proper rebuild... this all applies after you've done the checking the others have recomended... to check for vacume leaks, spray storage seal around the base of the carbs and along any maniflod gaskets... if they are leaking the engine RPM will change dramaticly.. storage seal ( or engine oil) is the safest thing.. in the past people used to use starting fluid... not a good idea...
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