Carburetor
On diagnosing faults, a lot of troubles, e.g.
insufficient performance or high consumption,
which are really due to the vehicle or to the
driver, are usually attributed to the carburetor.
But the carburetor cannot be blamed indeed
if the consumption, for instance, seems to be
too high. The arrangement of jets and the
carburetor adjustment have been carried out
at the factory through tests in order to obtain
a maximum of economy in consumption and
the best performance, as well. Therefore it is
rather absurd, if one tries to increase
performance or to lower the fuel consumption
figure by altering the carburetor adjustment or
by fitting jets of other sizes. It is possible to
lower the fuel consumption through smaller
jets, but this will immediately cause a
sensible loss of power, the engine risks
overheating and the valves burning, in short,
major repairs will result.
Therefore we mentioned in this chapter only
those jobs which can be done for the
maintenance and servicing of the carburetor.
The carburetor is regulated by means of two
screws, the volume control screw (figure 67)
and the idling adjusting screw (figure 66).
The volume control screw is best left with its
original adjustment set at the factory. If this
adjustment has been altered by some cause,
slacken lock nut of volume control screw, turn
the screw fully in with a screw driver, and
then back it off by 1 1/2 turns. This is best
done with a special tool and therefore you
should leave this job to an expert, (figure 68).
The regulating and adjusting described above
is all that can be done on the carburetor, by
laymen and experts. To clean the carburetor,
open the drain plug on bottom of float
chamber (figure 69), past having set the fuel
tap (figure 6) into its "Z" (off) position.
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