tuning and exhaust analyzers

["Luke M. Kowalski" <interfaces@domain.elided>]

I finally adjusted the Spica to idle and start
properly  (it is possible !).
I am having some difficulty setting the proper
mixture, though.  It is on a Spica Spider (74). I have
thought about getting an exhaust analyzer to get a
more accurate CO reading.
Every time my Spider needs to be smogged (2 more
times), I have to go through the 20 or so steps in
Ingram's book to put everything back. The one that is
difficult for me is screwing in or out the de-cel "by
ear".
Has anyone purchased one of these babies? Here is an
example of a portable (and affordable) one, but it
only measures CO, without the other two. It should be
enough, as that adjustment only needs a Co reading.

http://www.mossmotors.com/britishaccessories/tuningandmaintenance/ega.html

I also cannot get the timing right. I am shooting for
the M mark at 5000, but this might be wrong, since I
have a high compression engine and a Marelli Plex with
a faster advance (modified spring). Should this make a
difference?
When I get it to run sort of right, it is nowhere near
the mark, but it has a hesitation (does not want to
rev) from 1500 to 3000. If I time it right on the
mark, it backfires, but I could probably take care of
it by unscrewing the solenoid. I know I should set the
timing first...

It would be easy to go to the mechanic, but it's
personal now ! Any clues?

thx
luke, San Mateo, CA

74 Spider, 82 GTV6, 98 Audi A6 Q, empty space (I have
test-driven three 308GT4s now, and I am taking the
last one for a buyer's inspection)

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