Just curious here.   I know somewhere around 14.5:1 is stoichiometric (if
that is  that strange word and how you spell it) or the target ratio you
like to see out the tailpipe when the mixture is correct.

   I just did a dyno run with one of my motorcycles and it was really really
rich at around 10:1....yet it was still making decent power....Carbs need
jetting on this moto.  As I watched the Dyno tuning service guy work through
a few more modern fuel injected bikes while I waited in line....I was really
jealous of the modern stand-alone engine managment systems and how simple he
was tuning these bikes....gaining nearly 20% HP and torque on one that was
running "Fine" before...., just using his pinky finger on a laptop
keyboard...
  While I don't intend to invest in something like that for the moto in
question (I am selling that one).....I am really tempted to look at fitting
a MegaSquirt some other aftermarket controller to my inline ABA
motor....just to see.