Paul:
A few observations about your comments after having gone through all this
myself.
"very lean even with the needles screwed down fully clockwise" - The
needles adjusted fully clockwise, would enrich the mixture - that should not
be your problem
"the main jet is recessed about 1/8" below the body of the carb" - This
would seem to have the same effect as raising the needle higher - that is,
the same as going further clockwise with your adjustments further enriching
the mixture - that should not be your problem either.
You don't say when your lean symptoms appear or what your lean symptoms are
(rough running, etc.), but I had a lean running condition and my problem
wound up being the bypass valves on the carbs. I put new diaphragms in the
bypass valves and that cured my lean running problem. Another source of
trouble could be your temperature compensator assembly. Basically, either
one of these can let excess air through at the wrong time leaning out your
mixture.
-----Original Message-----
From: Paul Leach [mailto:pleach@vcsihome.com]
Sent: Monday, September 20, 1999 3:16 PM
To: Triumphs (E-mail)
Subject: TR6 Running Lean
<< File: ATT00072.html >>
I decide to take the advice and not install weber carbs. So I rebuilt the
Strombergs, reinstalled and balanced the carbs only to find that I am still
running very lean even with the needles screwed down fully clockwise..
I did not replace the jets or needles, however I did notice that the main
jet is recessed about 1/8" below the body of the carb. My Haynes workshop
manual does not help me here. So if a previous owner had replaced the jets
and they were sitting low this would explain the lean running. My question
is do the jets need to be installed flush with the body of the carb (top of
the jet flush with venturi) or is it recessed. If it is recessed and my jets
are set correctly, ideas on lean mixture.
Paul Leach
76 TR6
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