Checking The Pulser Coil; Checking The Pulser Coil Air Gap - Yamaha F50A Service Manual

Digital multimeter: YU-34899-A
Digital circuit tester: 90890-03174
Peak voltage adaptor:
YU-39991 / 90890-03172
Test harness (2 pins):
YB-06767 / 90890-06767
Charge coil output peak voltage:
Brown (Br) – Blue (L)
Unloaded
r/min
Cranking
DC V 144 137
Charge coil resistance (use as reference):
Brown (Br) – Blue (L)
272–408 Ω at 20 °C (68 °F)

Checking the pulser coil

1. Measure the pulser coil output peak volt-
age. Replace the pulser coil if below
specification.
WARNING
When checking the peak voltage do not
touch any of the connections of the digital
tester leads.
62Y3A11
Ignition system and Ignition control system
Loaded
1,500 3,500
169 129
NOTE:
• Use the peak voltage adaptor with the digi-
tal circuit tester.
• When measuring the peak voltage, set the
selector on the digital circuit tester to the
DC voltage mode.
Digital multimeter: YU-34899-A
Digital circuit tester: 90890-03174
Peak voltage adaptor:
YU-39991 / 90890-03172
Test harness (2 pins):
YB-06767 / 90890-06767
Pulser coil output peak voltage:
White/red (W/R) – White/black (W/B)
Unloaded
r/min
Cranking
DC V 6.3 3.5
Pulser coil resistance (use as reference):
White/red (W/R) – White/black (W/B)
396–594 Ω at 20 °C (68 °F)

Checking the pulser coil air gap

1. Turn the flywheel clockwise to align the
projection of the flywheel with the pulser
coil projection.
2. Measure the gap between both projec-
tions with a thickness gauge 1. Adjust if
out of specification.
Pulser coil air gap:
0.5–1.0 mm (0.020–0.039 in)
1
2
3
Loaded
1,500 3,500
7.4 11.2
4
5
6
7
8
8-16
I