Doc, I don't know where the "15°" is coming from unless it is because a lot of people like to run it rich, but the manual says "35-45° (reading pulsates)" swinging, so it should swing across 40°, which is 20° on eight cylinder scale.
The specs also calls for the engine to be fully warm, pipes hot, etc., not right after coming out of "closed loop", as in the video. (After a drive, to also clean the plugs etc, is good.)
The RPM is supposed to be temporarily set to 950 during the procedure.
And, being picky, the meter's ground should be connected to the ground reference connection at the right rear air horn (Blue).
I agree with Acmetowers, as the manual says that all base settings should be checked before setting the CO. (See D:04:01-05)
Since your reading looks close cold ("50-60, steady") and showing ~4° when warm (low/lean), it may be so far off that you haven't been turning it enough to matter, as Bitsy mentioned (common mistake). So, you might try the following (before/while you wait on your goodies):
First, keep track of where the screw is now ( just in case ;-).
Remember turning CW=Right=Richer and turning CCW=Left=Lean. (Needle works opposite!)
Turn the screw sloooowly to the right in increments to get it down to swinging across 20°.
Once you get it close, a little goes a long ways (very touchy to get exact).
Don't forget to plug the hole and wait a few seconds before taking a reading.
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Dave M vin 03572
Originally Posted by deloreandmcxii
