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ENGINE OVERHAUL
Main jet correction factor
The main jet strongly affects carburetion, hence the general performance of the engine. Climate factors such as external tem-
perature and altitude greatly affect the behaviour of the air-fuel mixture within the carburettor. It is thus necessary to modify the
original jet size, inferring the correction factor on the graph below.
EXAMPLE:
With a temperature of 25 °C and an altitude of 1000 m, a correction factor of 0.94 is obtained. Therefore, the main jet to
be used to replace the original one (142) will be: 142x0.94= 133.5; 134 jet available.
H06627
G.22
Ed. 05-2011
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