How To Adjust Air Fuel Ratio. So another jet change was made and a small adjustment made to the carbs. Lean mixtures ie greater than 147 produce hotter combustion gases than does a stoichiometric mixture.
Most CVK carbs have the airfuel mixture screw on the intake manifold side of the carburetor toward the engine away from the air filter. ALL of this a 1338 command air fuel and a disabled fuel trim learn. A mixture which is too rich meaning the mixture does not have the proper quantity of air can result in fouled sparkplugs and poor gas mileage.
For NA Applications - For cruise and idle situations a value of 147-150 stoic will be ideal.
Joined Sep 22 2017 1 Posts. Adjusting this screw changes how fast or slow an engine idles and how smoothly it runs. Best cruise ratio is around stoichiometric which is 147. The signal then triggers a reduction in fuel volume if the mixture ratio is rich and an increase in fuel volume if it is lean.
