Yamaha F40B - Charging System

ELEC
Electrical system
– +
8-25 67C3K11
Checking the power bobbin (for
Prime Start)
1. Measure the power bobbin 1 output
peak voltage. Replace the stator assem-
bly if below specification.
NOTE:
• To prevent the engine from starting when
cranking it, be sure to disconnect all spark
plug caps.
• Do not remove the clip from the engine
shut-off switch.
• When using the manual starter to crank the
engine, the voltage values may vary
depending on the speed at which the
starter handle is pulled.
2. Disconnect the power bobbin connec-
tors.
3. Measure the power bobbin resistance.
Replace the stator assembly if out of
specification.
4. Connect the power bobbin connectors.
Charging system
Checking the lighting coil
1. Disconnect the lighting coil connectors.
2. Measure the lighting coil 1 output peak
voltage. Replace if below specification.
NOTE:
• To prevent the engine from starting when
cranking it, be sure to disconnect all spark
plug caps.
• Do not remove the clip from the engine
shut-off switch.
• When using the manual starter to crank the
engine, the voltage values may vary
depending on the speed at which the
starter handle is pulled.
Power bobbin output peak voltage:
Yellow/black (Y/B) –
Yellow/black (Y/B)
r/min
Loaded
Cranking 1,500 3,500
DC V 7.0 28.0 77.7
S67C8056
Y/B
Y/B
Y/B
Y/B
1
Power bobbin resistance
(reference data):
Yellow/black (Y/B) –
Yellow/black (Y/B)
6.5–7.2 Ω at 20 °C (68 °F)
S67C8058
Y
Y
Y
B
Y
Gy
R
1