[TR] Mixture - Check and Adjust ZS 175 carbs

[Sujit Roy]

The ROM say the engine RPM should raise and then settle down if it is
running right. 0.8mm is som small. WIll I notice anything. The carbs have
been rebuilt, but needles are 50 years old.
I can check the plugs but I'm assuming after a few test runs. The carbs are
for a FED Stag.

Sujit

On Fri, Dec 17, 2021 at 10:20 AM DAVID MASSEY <dave1massey at cs.com> wrote:

> Is that for domestic cars or just European cars?  This is the technique
> used for decades for SU's but they had a piston lifting button that would
> lift the piston the prescribed amount.  The reason it worked is that the
> needle was profiled to run rich at idle and lifting the piston would lean
> it out.  When set right you will get a momentary increase in speed.
>
> When US Emissions standards wet in running rich at idle was no longer an
> option.  The needles were profiled to run lean at idle to meet the CO and
> HC levels prescribed by the EPA.  Lifting the piston on such a car will
> have no effect or will just cause it to slow down.
>
> The only accurate way to set the jets is with am exhaust gas analyzer.
>
> Dave
>
>
>
> -----Original Message-----
> From: Sujit Roy <triumphstag at gmail.com>
> To: Triumphs <triumphs at autox.team.net>
> Sent: Fri, Dec 17, 2021 11:32 am
> Subject: [TR] Mixture - Check and Adjust ZS 175 carbs
>
>
> The ROM for the Stag says to lift each air valve by 0.8mm and note the
> reaction of the engine. Is 0.8mm really enough? I can't make out any
> difference. My carbs needles are set to max lean. The car revs, in neutral,
> well without hesitation.
> The Stag uses the same ZS CD 175 as the TR6 I'm assuming the tuning is the
> same.
> Sujit
>
> --
> Sujit Roy
> Cupertino, California
>
> https://triumphstagblog.wordpress.com/
>
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-- 
Sujit Roy
Cupertino, California

https://triumphstagblog.wordpress.com/
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