Air valve return spring not fitted or incorrect to specifi-
cation.
Lack of power
Throttle valve not fully opening even though accelerator
pedal is fully depressed.
High fuel consumption
Any of the causes given for poor slow running or flat
spot
Fuel leakage from static seals such as float chamber
joint or O-ring seals for jet plug.
Variable-choke carburettor with swinging air valve
A new concept in variable-choke carburettor construc-
tion is to be found in more recent instruments of Ford
manufacture. Although a
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