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1980 shovelhead s&s superB carb,wont hold a consistent idle,but will when leaning on sidestand

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Take the float bowl off the carb and check the float level. If you don't know how to do that, go to S&S's site click on Technical Section, Click on Installation instructions and download the installation instructions for the Super "B" and "E" model carbuetors. The easiest way to check the float setting is to turn the bowl upside down. The end of the float on the far side from the needle and seat should be 1/8" above the lower edge of the bowl with the bowl upside down.

Another problem with the Super "B" carb, and the rest of the carbs designed like them including the "E" and "G" and Bendix, is that the throttle plate shaft wears and starts sucking air . There is a "master rebuild kit" available for the Super "B". It's expensive but not nearly as expensive as a new "E" model. S&S just stopped production on the "B" about a year ago but parts are still available for them. It would be best to take the carb off the engine and completely disassemble it. Then take it and the new bushings to a machine shop and have them machine the bores for the new throttle shaft bushings. This might help insure that he bushings are put in the exact line they need to be for the throttle shaft to be in the correct location relative to the bore of the carb.

Posted on Oct 24, 2010

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