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CHECKS AND MAINTENANCE
53
GB
NOTE
Failure to successfully complete the above procedure can be the result of an improp-
erly sized idling jet.
a) If the mixture adjusting screw is turned until it stops and no changes in the idle
speed are observed, a smaller idling jet is required.
b) If the engine stalls when the adjusting screw is still two turns open, a larger idling
jet is needed.
Naturally, after replacing the jet the adjusting procedure will have to be restarted
from the beginning.
•Turn the adjusting wheel until you obtain the desired idle speed.
•The idle speed will have to be adjusted again in case of marked changes in the
outside temperature and riding altitude.
CARBURETTOR WEAR GUIDELINES
The throttle valve, the needle valve and the needle jet are subject to heavy wear
due to engine vibrations.
This can result in carburettor malfunctions (e.g. mixture enrichment).
CHECKING THE FLOAT LEVEL
(fl oat height)
Remove the carburettor and the float
chamber. Tilt the carburettor so that the
fl oat touches the fl oat needle valve without
pressing it too hard.
In this position the fl oat edge should be
parallel with the fl oat chamber sealing
surface (see fi gure).
If the fl oat height does not correspond to
the nominal value, check the fl oat needle
valve and if necessary replace it.
If the needle valve is in working order,
adjust the fl oat height by bending fl oat
lever 3.
Fit the fl oat chamber, install the carburettor
and adjust the idle speed.
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