At 03:20 PM 09/19/2003, you wrote:

>Is it possible to set the CO adjust screw on a new AFM properly without
>a CO sniffer?

In a word, No. The proper procedure is with a CO measurement.

>  If you get it close but not exact somehow, what are the
>possible adverse affects?

How will you know it's close??? Too lean, overheat, burn pistons. Too rich,
carbon fouling, and gas fouling of the oil. In both cases it can seem to be
running just fine and damage might build slowly over time, unseen.

>Just rougher running?  Couldn't you
>theoretically tinker with it until you were getting a reasonably balance
>of power and mileage?

There is one good thing about tinkering, it's cheaper than any other
alternative right up to the point of failure.