Yamaha F50D Servise Manual - page 104
Electrical system
5-15
ELEC
4.
Measure the charge coil resistance.
Replace the stator assembly if out of
specification.
5.
Connect the charge coil coupler
a
.
Checking the CDI unit
1.
Measure the CDI unit
1
output peak
voltage. Replace if below specification.
TIP:
9
To prevent the engine from starting when
cranking it, make sure to disconnect all
spark plug caps.
9
Do not remove the clip from the engine
shut-off switch.
9
Make sure to check the charge coil and
pulser coil before measuring the CDI unit
output peak voltage.
Checking the thermoswitch
1.
Disconnect the thermoswitch connectors
a
.
2.
Turn the engine start switch to “START”,
and then measure the input voltage (CDI
unit end). Replace the CDI unit if below
specification.
TIP:
9
To prevent the engine from starting when
cranking it, make sure to disconnect all
spark plug caps.
9
Measure the input voltage while the engine
is cranking.
Charge coil resistance (reference data):
Brown (Br)–Blue (L)
272.0–408.0
Ω
at 20 °C (68 °F)
CDI unit output peak voltage
(reference data):
Black/Orange (B/O)
a
–Black (B)
Black/White (B/W)
b
–Black (B)
r/min
Loaded
Cranking
1500
3500
DC V
150
150
120
O
B/O
B
B
O
B
B/W
a
b
1
b
a
CDI
Thermoswitch input voltage
(reference data):
Gray/Black (Gy/B)–Black (B)
4.0 V
Gy/B
Gy/B
B
B
CDI
a
a