With the vehicle leveled on the ground and the engine at normal operating temperature, check the primary and secondary fuel level sight glasses on the side of the carburetor. Drive the engine rapidly from idle to 3000 rpm and back again several times, then let the engine idle. If the fuel level is not in the center of the window, correct it by turning the adjusting screws that are located in the recesses above the inspection windows.
Do not turn the adjusting screws more than 1/8 turn every 15 seconds.
When the correct fuel level is in the window (Oh) reached, mark the screws with white paint.