No, AFR may influence how the timing affects combustion, but the AFR is already set when ignition occurs.
A certain AFR may need different timing requirements to make full combustion, but unburned fuel is not a 'rich' or 'lean' AFR.
It's incomplete combustion.
Different fuel properties like % of alcohol in gasoline or other qualities will require different timing and it probably will require different AFR.
(like altitude, temperature, etc will cause different AFR requirements possibly)
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