Yamaha 250GETO, Service Manual

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6S35H11 4-10
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Carburetor
Disassembling the carburetor
NOTE:
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Before disassembling the carburetors,
make sure to note the number of times the
pilot screw is turned out from the seated
position to its set position.
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Disassembled jets and other components
should be sorted out and kept in order, so
that they can be re-assembled in their orig-
inal positions.
Checking the carburetor
1. Check the air and fuel passages and jets,
for dirt and foreign matter. Clean the car-
buretor body with a petroleum based sol-
vent if necessary.
2. Blow compressed air into all passages
and jets.
c C
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Direct the compressed air downward,
otherwise cleaning solvent may be
blown into your eyes or small parts of
the carburetor may be blown off.
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Do not use steel wire for cleaning the
jets, otherwise the jet diameters may be
enlarged, which may seriously affect
performance.
3. Check the main jet, pilot jet, and main
nozzle for dirt or residue. Clean if neces-
sary.
4. Check the pilot screw and needle valve
for bends or wear. Replace the pilot
screw and needle valve if necessary.
5. Check the float for deterioration. Replace
the float if necessary.
6. Measure the float height
a
. Replace the
float and needle valve as a set, if out of
specification.
NOTE:
When measure the float height, the float
should not be compressing.
6D440025
1
a
6G440080
6G440090
Float height
a
(without gasket):
15.5–16.5 mm (0.61–0.65 in)
Digital caliper 1 : 90890-06704
6B440040
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