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@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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