I had a "too lean" experience recently. I was running my '74 spit with
no air cleaner, and the '75 carb I put on tuned up fine at idle, but
over 2500 rpm it ran poorly. I put just the case on, no filter (yet) and
the problem went away.
You can get a long 1/8 allen in to adjust the carb, but you need to hold
on to the slide to keep from tearing the diaphragm. I'd rather use the
tool, but I don't have one as yet.
> ----------
> From: Pete & Aprille Chadwell
> Sent: 1997October27 06583ΒΙ
> To: triumphs@autox.team.net
>
>
> Mike wrote:
>
> >>Naturally, Chauncey,
> >>(our TR6) saw that I was too happy and immediately started acting
> the
> >>same way,
> >>although without the black smoke (too lean?) at least on one carb.
> Can't
> >>seem
> >>to find the really good information about how to adjust the idle
> mixture.
> >>VB
> >>shows a tool for adjustment which looks very different that the tool
> >>shown in
> >>Bentley or the Kenneth Ball/Autopress book.
> >>
> >>Further, the articles available on team.net say that not all
> Strombergs
> >>had a
> >>mixture adjustment. This is a 70. Can anyone point me in the
> right
> >>direction?
> >> The six seems to drop out one or two of the cylinders at idle.
> Don't
> >>think I
> >>got a leak in the manifold, as it was just replace a couple of years
> ago,
> >>and
> >>the car ran fine. I know that I will need to change the plugs and
> points
>
> Mike:
>
> To my knowledge, all TR6s fitted with ZS carbs had a mixture
> adjustment.
> The adjustment is made by inserting a tool into the dashpot bore and
> turning either clockwise or "anti"clockwise. If my memory is correct,
> turning the screw clockwise richens the mixture and the reverse leans
> it
> out. (What's happening here is that the needle is being either raised
> or
> lowered in the jet, creating either more room around the needle
> through
> which fuel can flow, or less...) You need the special tool to do
> this... I
> have seen two different tools, but they both do the same thing...
> provide a
> means to hold the piston in place (keep it from rotating when you turn
> the
> tool) while allowing the adjuster inside to be turned.
>
> On my TR6, I cannot get a rich enough mixture. As I understand it,
> this is
> most likely the result of worn throttle shaft bushings, which are
> admitting
> air into the intake downstream of the venturi, resulting in a lean
> air/fuel
> ratio. You may encounter the same difficulty. It is repairable,
> however,
> by removing the carbs and having them rebushed.
>
> Good luck!
>
> Pete Chadwell
> 1973 TR6 CF10732
>
>
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