David,
It's my impression that the 'twelve flats' is counted from the setting at
which the jet is flush with the bridge, rather than with the adjusting nut all
the way up.
Bud Krueger
David Councill wrote:
> Bill,
>
> I'll send this reply to the list too since it might prove helpful. I have a
> fair working knowledge of SU carbs although miniscule compared to some on
> the list. There are several things that could cause your carbs to run rich
> but since you mentioned tightening the mixture adjusting nuts all the way,
> I would suspect the jet tube placement as a place to look.
>
> I patched together a quick set of pictures here:
> http://www.imt.net/~dcouncil/mg/65carbs.html
>
> My son's error would cause symptoms like yours. Or alternately, your choke
> linkage could be adjusted in such a way that the jets would be lowered,
> making any attempt to lean your mixture with the mixture adjustment nuts to
> be futile.
>
> The default setting of "twelve flats" on the mixture adjusting nuts is
> usually a good setting. That is twelve sides of the nut or two complete
> rotations down after tightening the nut all the way. I've tried all those
> fancy ways of tuning and even used the Gunson colortune tester, but in the
> end I've always ended up with twelve flats summer and 14 flats during the
> winter.
>
> David
> 67 BGT
> 72 B
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