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Re: [TR] Issues with Temp. compensators on a ZS CD 175

To: Sujit Roy <>
Subject: Re: [TR] Issues with Temp. compensators on a ZS CD 175
From: Jeff Scarbrough <>
Date: Wed, 19 Jan 2022 12:06:25 -0500
Cc: Triumphs <>
References: <>
As I understand it, they also bypass air around the throttle plate.
But I'm not sure...

This guy has a pretty good video on 175 carb operation in general, and
toward the end of this one he shows how to check the operation of the

Some diagrams in this thread too

On Tue, Jan 18, 2022 at 12:20 PM Sujit Roy <> wrote:
> I've been running into issues with my ZS carbs. The problem is as the car 
> gets to operating conditions, the RPMs goes up from about 800 rpm  to about 
> 1000.
> I have carbs with by-pass valves, but they are blocked off.
> Folk have said it's the temp. compensators. I rebuilt the carbs and have 
> adjusted the compensators according to an article on Buckeye Triumph. 
> Suggestions have been to tighten the adjustment screw so they don't open.
> So I have just read the Dealer Training on the subject of Carburetion. I see 
> how the compensators work and make the fuel mixture leaner when at operating 
> temperature. The doc says when they open, it weakens the depression which 
> allows the piston to fall slightly thereby cutting the available fuel and 
> creating a leaner mixture. This I get, but with the throttle plate in the 
> idle position, and the volume of air passing the throttle plate can't change, 
> then why does the engine speed increase?
> Regards, Sujit
> --
> Sujit Roy
> Cupertino, California
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