Home › Forum › Ask A Member › 1966 3 hp lightwin Carb problem › Re: 1966 3 hp lightwin Carb problem
The main jet orifice is a mere 0.029" in diameter and it clogs pretty easily. Also, even if the hole is open, if there is crud built up behind the hole inside the counterbored area it will still impede flow. The orifice plug should be removed and carefully cleaned. It takes a special tool or a carefully modified screwdriver to reach into the slot to remove it.
That said, I have a ’66 JW that I replaced the old crudded up orifice with a brand new one. It still does not run like it should and I need to remove the carb again and give it a chemical dip and blow it out with aerosol and compressed air to try to clear it out. The passages are.very small in these carbs and clog up pretty readily if fuel is left in them.
-Ben
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