Actually unless you are below 59 deg the cold start valve doesn't work. This means that the combined enrichment of starting and starting cold allows fuel to flow at cranking speeds. The amount of fuel is that which runs the car 20 miles to the gallon or about twenty minutes to a gallon at road speed.

If you think about that, you will see that the amount of fuel used in each stroke is quite small. It won't spurt. Even if the airflow plate is held way down the flow will be small.

The mechanism I use for basic setting of mixture after the fuel distributer has been replaced is to bypass the fuel pump relay and adjut the mixture till fuel rises in the threads on a removed fuel line. Once flow is noticed the mixture is adjusted lean till it doesn't flow. Key on engine not spinning there should be no flow. Push the plate down and there should be even flow from all six chambers.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician