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What is the float height setting for a 1984 harley davidson ironhead sportster with stock carburetor

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With the float bowl off and the float assembled in the carb, hold the carb on it's side with the needle and seat hinge upwards.

Set the float height to 0.630" to 0.670" (16-17mm) from the "bottom" of the float to the gasket surface where the float bowl gasket seal is.

These carbs are notorious for leaking past the needle and seat even when the float level is set correctly. They make a tool for refurbishing the seat in the carb as it is not replacable but the tool is very expensive for what it is and the amount of use will get out of it ($100). Sometimes I've set the float level an additional 1mm low (18mm) to put more pressure on the needle if it does leak. Good Luck!

Posted on Nov 13, 2009


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I have a 2003 harley sportster When I Start it the over flow vent hose flows gas. What do you think the problem is? Thank you Tom

It sounds like your float level is just a bit high in the carburetor. Your bike is equipped with a vacuum operated petcock. When the engine is not running, there is no vacuum on the intake and therefore, not vacuum on the petcock. When there is no vacuum on the petcock, the fuel is turned off.

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