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Stoichiometric means chemically correct. Assuming are fuel is just CH, a stoichiometric mixture would burn like this:
CH + O2 = CO2 + H2O
If you richen the mixture, you can burn extra fuel and the burn becomes:
CH + O2 = CO + CO2 + H2O
Carbon monoxide is produced instead of carbon dioxide when the oxygen is insufficent. Please note my bad chimistry equations are for illustration purposes only. :)
About 10 years ago a friend of mine had a dyno & I spent alot of time there. His gas analyzer was of the older variety that measured CO output & it didn't give a mixture ratio. 3-4% CO was a good range for most engines for maximum horsepower, turbo cars did well with 5-7% CO.
Cheers,
Paul.
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