[TR] Mixture - Check and Adjust ZS 175 carbs

[DAVID MASSEY]

 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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