Checking The Prime Start; Assembling The Carburetor - Yamaha F50A Service Manual

5. Check the float for deterioration. Replace
it necessary.
6. Measure the float height a. Replace the
float and needle valve, if out of specifica-
tion, as a set.
NOTE:
• The float should be resting on the needle
valve 4, but not compressing it.
• Take measurements at the top of the float
flange opposite its pivoted side.
Float height a:
10.0 ± 0.5 mm (0.39 ± 0.02 in)

Checking the Prime Start

1. Measure the length of the Prime Start
plunger.
2. Connect the positive Prime Start blue (L)
lead and the negative Prime Start black
(B) lead to a battery as shown.
3. Measure the plunger length a after
applying power for 5 minutes. Replace if
out of specification.
62Y3A11
Prime Start plunger extended length a:
24.6 mm (0.97 in)

Assembling the carburetor

1. Install the main nozzle 1, plug 2, pilot
jet 3, and main jet 4 to the carburetor
body as shown.
4
3
Carburetor
1
2
3
2
4
1
5
6
S62Y4270
7
8
4-20
I