With the car leveled and the engine warmed up to normal temperature, check the primary and secondary fuel levels through the inspection windows on the carburetor side. Quickly rev the engine up to 3000 rpm several times, then let it idle. If the fuel level does not touch the mark, adjust it by turning the adjusting screws, which are located in the recesses above the inspection windows.
Do not turn the screws more than 1/8 turn every 15 seconds.
Once the correct fuel level is established, place white paint dots on the adjustment screws.