I had the same problem. Fixed it by raising the fuel level in the jets by
adjusting the floats. Stu
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> From: M.W. Jordan Jr. <mw_jordan@nationalpicture.com>
> To: triumphs@autox.team.net
> Subject: TR3A tuning problems
> Date: Tuesday, April 15, 1997 5:56 PM
>
> Listers
>
> I am trying to get a 59 TR3A running a lot better than it is right now.
>
> The car has Stromberg 175CD carbs and will not run smoothly at speed
> without the choke pulled way out. It will idle fine with the choke in
once
> it warms up, but put any load on it and it sputters, backfires and
> generally is not happy.
>
> I disassembled the carbs, put new gaskets, needle valves and the like out
> of a carb rebuild kit about a month or so ago. The mounts to the intake
> manifold are good, there do not seem to be any air leaks there. Fuel
> filter is fine and gas tank does not appear to have water or other
> contaminants in the fuel.
>
> The Haynes manual describes the tuning of the Stromberg carbs as setting
> initially and then lifting the piston about 1/32 of an inch, with a stall
> indicating rich (or Lean, I don't have the book in front of me) and an
> increase in idle indicating lean (or rich, see above). When I try this
> tuning approach, I get no difference in idle, suggesting the setting is
> correct, but I know that not to be the case.
>
> Any suggestions, or is the TR3A just very cold natured and I may not have
> let it run long enough to really get warm - even though the temp gauge
> works up to 160-170 when I do these tests.
>
> Any help would be appreciated.
>
> M. W. Jordan, Jr.
> Greenwood, MS
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