Checking The Prime Start; Assembling The Carburetor - Yamaha F25C Service Manual

NOTE:
• The float should be resting on the needle
valve 1, but not compressing it.
• Take measurements at the float position
shown opposite its pivoted side.
Float height a:
8.7–9.7 mm (0.34–0.38 in)

Checking the Prime Start

1. Measure the length of the Prime Start
plunger.
2. Connect the Prime Start yellow (Y) leads
to a 12 V battery as shown.
3. Measure the plunger length a after
applying power for the times indicated in
the following table. Replace if out of
specification.
6D55F11
Prime Start plunger extended
length a (reference data):
10.7–15.4 mm (0.42–0.61 in)
Time (min)
0
1
3
5
7
10
4. Measure the prime start resistance when
the prime start plunger length is 10.7 mm
(0.42 in).
Prime Start resistance
(reference data):
Yellow (Y) – Yellow (Y)
17.7–18.7 Ω at 20 °C (68 °F)

Assembling the carburetor

1. Install the main nozzle 1, main jet 2,
pilot jet 3, and plug 4 to the carburetor
body as shown.
4
3
Carburetor
Length (mm [in])
10.7 (0.42)
12.6 (0.50)
14.1 (0.56)
14.8 (0.58)
15.3 (0.60)
15.4 (0.61)
2
1
S6D54110
4-12
1
2
3
4
5
6
7
8
9