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blawrence
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Joined: 12-08-2009
Location: North Carolina USA
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Cannot seem to get fuel/air mix lean enough. Maybe a new needle is needed in the strombergs. Does anyone know where to get replacement needles? Is it always the needle that wears or does the orifice wear too?

Arvin Appelman
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Joined: 03-14-2005
Location: Columbia, Tennessee USA
Posts: 50
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I have never had to replace the needles unless they are pitted these items don't typically wear.
Are the float levels set and needle valve closing? Other things to check would be the fuel pressure, chokes fully open, and air cleaners.

Frank Schwartz
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Joined: 02-18-2011
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Arvin:
I think Delta sells the needles and you would probably want to get the seat as well...I also think Bruce Madden has them...in fact, I think I bought some from him years ago.
Frank

redracer
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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).



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