At the end of the previous episode, our hero had replaced the torn
diaphragms in his ZS carbs in order to allow them to be balanced. His
earlier misdiagnosis that the problem was the front carb's bypass valve
proved incorrect. In fact the diaphragm in the rear carb was ripped.
We now join him re-adjusting the carbs:
Hmmm. Idle speed is wandering between 500 and 900 RPM. Maybe I somehow
screwed up the front carb's bypass valve when I removed it. Let's install a
gasket to disable it. Uh-oh, the problem is not corrected.
A couple of days later:
Let's try a dummy gasket to disable the rear carb's bypass valve. Great, now
the idle is rock solid.
So, I guess the torn diaphragm in the rear carb was masking the problem with
it's bypass valve. Carbs now balanced and pretty darn good idle.
Now, one more observation: With headlights on, idle speed drops 1000 RPM.
This seems excessive to me. Is this normal behavior on a TR6?
Thanks,
Hugh Fader
72 TR6
(every day in every way it's getting better)
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