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

[Jeff Scarbrough]

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
TC.

https://www.youtube.com/watch?v=g0UseZTKaO8&ab_channel=MidwestMotoring

Some diagrams in this thread too
https://forum.etypeuk.com/viewtopic.php?t=16206

On Tue, Jan 18, 2022 at 12:20 PM Sujit Roy <triumphstag at gmail.com> 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
>
> https://triumphstagblog.wordpress.com/
>
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