I just checked exhaust emissions for my '87 BMW 316, and found that CO is high, ~6.
I adjusted that wit a mixture screw on the carburetor, and it went down to 1 (as it should for my engine).
But I do not have the correct data for my engine for HC, CO2 and O2. Last one I can not remember, but HC is ~170 ppm, and CO2 is ~12%.
Emissions are not checked at our equivalent of your MOT, but I want to get it right.
So, are the numbers OK, and if not, what needs to be adjusted, and how?