Yamaha F2.5A Service Manual page 57

2. Blow compressed air into all passages
and jets.
CAUTION:
• Direct the compressed air downward,
otherwise cleaning solvent may be
blown into your eyes or small parts of
the carburetor may be blown off.
• 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 1, pilot jet 2, and
main nozzle 3 for dirt or residue. Clean if
necessary.
2
3
4. Check the pilot screw and needle valve
for bends or wear. Replace if necessary.
69M3E11
1
S69M4060
5. Check the float for deterioration. Replace
if necessary.
6. Measure the float height a. Adjust the
float height by bending the tab 4 if out of
specification.
4
5
NOTE:
• The float should be resting on the needle
valve 5, but not compressing it.
• Take measurements at the end of the float
opposite its pivoted side.
Float height a:
10.5–11.5 mm (0.413–0.453 in)
Carburetor
1
2
3
4
S69M4090
5
6
7
a
S69M4100
8
9
4-8