Yamaha F30A, Service Manual

Page: 88 / 285

FUEL
Fuel system
4-13
67C3K11
2. Blow compressed air into all passages
and jets.
WARNING
Wear appropriate protective eye gear dur-
ing the cleaning process to prevent any
eye injury by the blown-off debris or liq-
uid.
3. Check the main jet, pilot jet, and main
nozzle. Clean if there is dirt or residue.
CAUTION:
Do not use steel wire to clean the jets,
otherwise the jet diameters may be
enlarged, which may seriously affect per-
formance.
4. Check the pilot screw and needle valve.
Replace if worn or deformed.
5. Check the float. Replace if cracked or
deformed.
6. Measure the float height
a
. Replace the
float
1
or needle valve if out of specifica-
tion.
NOTE:
Take measurements at the float position
shown opposite its pivoting side.
Checking the Prime Start
1. Measure the Prime Start resistance
when the Prime Start is cold.
NOTE:
The following resistance is when the ambient
temperature is 20 °C (68 °F) and there is no
power supplied.
2. Measure the length of the Prime Start
plunger before supplying power.
3. Connect the Prime Start blue (L) leads to
a 12 V battery as shown. Measure the
plunger length
a
after supplying power.
S67C4022
S6AG4200
Float height
a
:
12.0–16.0 mm (0.47–0.63 in)
Prime Start resistance
(reference data):
Yellow (Y) – Yellow (Y)
20.0–23.0
Ω
at 20 °C (68 °F)
Prime Start plunger length before
supplying power (reference data):
10.7 mm (0.42 in) at 20 °C (68 °F)
S67C4024
a
1