Kendall---The questions you posed would take more space to answer than this
list would allow, so I'll give you an outline. Write back to me off list if you
like, for the details. Meanwhile...
The a/f ratio you're looking for is between 15 to 1 and 13 to 1. 14.7:1 the
ideal.
If you have carbs with non-adjustable needles, you may have the kind that can
be adjusted by raising, or in your case lowering the jet(s).
Be sure there is no un-metered air (leaks)entering the intake manifold, which
would lean out the mixture.
Consider connecting an H-Pipe above and between the two down-pipes to get some
reading from the front carb.
Be sure the 02 sensor gets hot enough to get a true reading. Otherwise it will
show leaner than it really is.
The fuel pickup tube (jets) being in the center of the float bowls shouldn't
necessarily starve out when making turns. In any case, try setting the floats
at the highest of the ranges given in the ZS manual.
You probably won't burn a valve unless you drive a good deal of the time with
an a/f mix with the gauge showing readings of 18:1, or "off the scale" lean.
I've had 02 sensor and a/f monitor in and running for about 10 years now. I
really enjoy it's reporting!
Dick
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