23
CARBURETTOR
a) Carburettor. When handling the carburettor and adjacent parts there may be tra-
ces of fuel that need to be drained first.
Be cautious: fuel is highly flammable and toxic.
It is advisable to periodically check the carburettor, washing and drying it with
compressed air to improve its performance.
Check the height of the float that marks the level of fuel in the carburettor and
adjust it so it is at 17mm within the specified margins.
CARBURETION OF THE MIXTURE ADJUSTMENT OF THE
IDLE SPEED
An optimum petrol-air mixture will enable you to
obtain maximum performance from your engine.
To do this, you need to adjust the amounts of fuel
and air entering the carburettor.
A good way to find out the quality of the mixtu-
re that is going into the engine is to inspect¬ the
spark plug. If the plug is light brown in colour, the
mixture is good, whereas if it is black (excess of pe-
trol), or white (ex¬cess of air), the mixture reaching
the engine is wrong.
To control the amount of fuel reaching the engine
you can adjust the position of the main jet, which
has a graduated scale, where the higher the num-
ber indicates the greater the flow of fuel. You can
also control the mixture by adjusting the air screw,
unscrewing it to enrich the mixture and vice versa.
The carburettor has two ad-
justment screws: the air screw
and the idle speed screw,
which allow you to change
the speed of operation if you
so require.
a
b
c
b) Idle speed c) Air
25 - Carburettor 26 - Carburetion of the mixture 27 - Ajuste del Ralentí
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