Paul,
I think that using an O2 sensor is a great idea. BUT, first off, the standard
sensor has a minimal region of linear response, so for the mest part you will
only read "rich" or "lean".
A wide-band sensor has a much longer (mostly) linear region. But you need some
special electronics to drive and read it. There are a few different devices
such as this around. I have one of these: http://www.innovatemotorsports.com
It works well, and I use the adapter that allows you to sitck it up the
tailpipe to get your readings. Unfortunately, it does require a reasonably
well sealed exhaust system.
I found that the local gasoline with ethanol added clearly needs richer needles
on the carbs. About 5% righer overall. It seems we have 10% ethanol in the
gas. The sensor works really well.
-Tony
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