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The fast idle on my single Stromberg carb ('75 MGB) seems excessively high at about 2500 RPMs at startup. When I then kick it down, it seems too slow for satisfactory warmup but eventually works its way up as it warms up. How can I adjust the fast idle so that the initial RPMs are something around 1500 or so? Perhaps I should ask what the initial revs should be when the choke is first set. I think that 2500 too high on a cold engine. Other than the initial high revs the choke seems to work OK.
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Fast idle adjustment
- Thread starter ceedub
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Bret
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Yes, /ubbthreads/images/graemlins/eek.gif 2500rpms is way too high for a “stock” ZS setup.
BTW - Welcome to the forum! Lots of great folks here.
Anyway the first thing I’d do is try & reset the idle to 850RPMs Factory for a . But it sounds like you have a problem with the choke (automatic enrichment) settings are the reason for the high idle.
Try turning the idle screw down – if that doesn’t work you have other issues.
A safe bet would be to try to do a complete tuning - fuel mix, timing, plugs & wires if its been a long time too. If you don’t have one yet, get a good Manual for your MGB (Bentley 75-80 or Haynes) and a Moss catalog for their little tech tips. Next a timing light, tachometer, a Zenith Stromberg adjustment tool and a way measure your fuel mixture. Gas analyzer or a color tune will work but the analyzer is by far the more accurate and worth the money if you live in a state that requires smog testing on you B like mine (California) still does.
Good luck,
BTW - Welcome to the forum! Lots of great folks here.
Anyway the first thing I’d do is try & reset the idle to 850RPMs Factory for a . But it sounds like you have a problem with the choke (automatic enrichment) settings are the reason for the high idle.
Try turning the idle screw down – if that doesn’t work you have other issues.
A safe bet would be to try to do a complete tuning - fuel mix, timing, plugs & wires if its been a long time too. If you don’t have one yet, get a good Manual for your MGB (Bentley 75-80 or Haynes) and a Moss catalog for their little tech tips. Next a timing light, tachometer, a Zenith Stromberg adjustment tool and a way measure your fuel mixture. Gas analyzer or a color tune will work but the analyzer is by far the more accurate and worth the money if you live in a state that requires smog testing on you B like mine (California) still does.
Good luck,