It is much more sensitive to adjustment in the float level and needle valve than the other type.
The first was sure that there was dirt on the point of the needle valve, in the carburetor.
Do you think we'll get on the right track if we put the needle valve in?
Here is situated a needle valve from which the air is allowed to escape.
After leaving the needle valve the gasoline flows along the pipe S, Plate 25, until it reaches the evaporating coil, N.
Consequently the needle valve nut should be moved but the small fraction of a turn for each adjustment.
The float may bind on its guide, the needle valve regulating the gasoline-inlet opening in bowl may stick to its seat.
When the level of gasoline in the float chamber was lowered the float would fall and the needle valve uncover the opening.
It will be noticed that a metering pin or needle valve opens the jet when the air valve opens.
When this adjustment is secured the lock nut is screwed in place so the needle valve will keep the adjustment.