Mercedes-Benz Ponton
Solex Carburetors Miscellaneous Considerations

Douglas P. Broome / / November 25, 2019

Miscellaneous Considerations Pertaining to Solex Carburetors in Mercedes-Benz Pontons

  • The carburetor is running lean if there is backfiring and popping upwards out of it.

  • If there is black soot in the outlet of the tailpipe, and/or puffs of dark smoke coming out of it, the engine is running rich.

  • The car idles (1500 rpm or below) on an idle circuit in the carburetor, which is a separate series of passages in the carburetor; they function only to allow the car to idle.

  • Any speed above idle speed (1500 rpm or below) uses the main circuit in the carburetor, which is fed by the accelerator pump diaphragm.

  • Drive the car and accelerate. As it starts to pop and hesitate, pull out the choke, which enriches the gasoline/air mixture. The car's operation should smooth out.


Created: November 25, 2019 / Jeff Miller
Last Update: November 25, 2019

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