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 Posted: 07-31-2016 03:23 pm
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redracer

 

Joined: 09-10-2012
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Yes, both the needles and to a lesser extent the orifice wear due to the design. Unlike SU carbs where the needle does not touch the sides of the orifice, the spring loaded Strombergs were designed to have the edge running against one side of the orifice, making the faster wearing needle run rich, mostly at idle. Use a CO meter to adjust the mixture to 4% at about 3000 rpm and don't worry about the idle mix (unless your state still requires mandatory emission tests).