Checking The Prime Start - Yamaha F30A Service Manual

FUEL
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.
4-13
Fuel system
S67C4022
S6AG4200
a
NOTE:
Take measurements at the float position
shown opposite its pivoting side.
Float height a:
12.0–16.0 mm (0.47–0.63 in)

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.
Prime Start resistance
(reference data):
Yellow (Y) – Yellow (Y)
20.0–23.0 Ω at 20 °C (68 °F)
2. Measure the length of the Prime Start
plunger before supplying power.
Prime Start plunger length before
supplying power (reference data):
10.7 mm (0.42 in) at 20 °C (68 °F)
3. Connect the Prime Start blue (L) leads to
a 12 V battery as shown. Measure the
plunger length a after supplying power.
1
S67C4024
67C3K11