CO2 - Carbon dioxide: This is the relative efficiency of the burn from complete combustion of the fuel. At all engine speeds, the best power will generally be found within less than a 0.3% change.
O2 - Oxygen: If the percentage is high, it indicates that more ignition advance can likely be used, or that the different cylinder offsets/staggers need correction due to a lean condition in one cylinder.
CO - Carbon monoxide: Mixture strength from partially burned fuel. If a given throttle position makes best power at a given percentage. All other throttle positions will be very close to this reading at best power.
HC - Total hydrocarbons in parts per million: Unburned fuel - Shows general state of engine health with lower readings for good large bore engines, and higher readings for good small bore engines.
NOx - Nitrogen Oxides in parts per million: High readings indicate high combustion temperatures and can be a precursor to detonation. Among many things, this hydrocarbon count indicates compression and squish/quench conditions, as well as spark strength and combustion dynamics
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