First, you should make sure that the needle is actually adjusting
properly, by removing the piston assembly, turning the adjustment, and
verifying that the needle actually moves in and out. You might need
to check that the needle
and adjuster have not gotten forced upwards into the piston. Then
check that the side of the needle and
the jet (pressed into the carb body) are not badly worn. And of
course make sure that the diaphragm is not damaged. Also make sure
that a wrong or improperly installed gasket is not blocking the vent
passages between the air filter and the carb, and the piston housing
and carb body (assuming there is a gasket between them- I forget).
Good Luck,
Doug Braun
'72 Spit
On Wed, Jun 15, 2011 at 4:39 PM, Matthew Milkevitch
<mmilkevitch@yahoo.com> wrote:
> Fellow Listers;
>
> Recently I rebuilt the Stromberg Carb on my '77 Spitfire. The rebuild went
> well, I got everything installed and the car started up easily. However,
> during tuning I have discovered that I cannot get the car lean enough. I
> have the needle adjustment almost at the end (roughly 3 turns out) and the
car
> just won't lean out. The choke is off and the diaphragm is new and intact.
> The ignition seems to be fine and the timing is set to stock specs. The
plugs
> are quite sooty. Anyone have any idea why I can't lean this out any more?
>
> BTW, the carb is from an 70-74 spitfire.
>
> Thanks for any input,
> Matt Milkevitch
> '77 Spitfire
> Willow Grove, PA
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