Yamaha MTN1000 2016 Service Manual page 617

unit terminal as shown.
c. Check the relay unit (diode) for continuity.
d. Check the relay unit (diode) for no continuity.
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EAS30558
CHECKING THE IGNITION COILS
The following procedure applies to all of the igni-
tion coils.
1. Check:
• Primary coil resistance
Out of specification  Replace.
Primary coil resistance
1.19–1.61 
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a. Disconnect the ignition coil coupler from the
ignition coil.
b. Connect the pocket tester (  1) to the igni-
tion coil as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
Ignition coil terminal "1"
• Negative tester probe
Ignition coil terminal "2"
c. Measure the primary coil resistance.
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2. Check:
• Secondary coil resistance
Out of specification  Replace.
Secondary coil resistance
8.50–11.50 k
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a. Connect the pocket tester (  1 k) to the ig-
nition coil as shown.
ELECTRICAL COMPONENTS
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Negative tester probe
Ignition coil terminal "1"
• Positive tester probe
Spark plug terminal "2"
2
b. Measure the secondary coil resistance.
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EAS30556
CHECKING THE IGNITION SPARK GAP
1. Check:
• Ignition spark gap
Out of specification  Perform the ignition
system troubleshooting, starting with step 5.
Refer to "TROUBLESHOOTING" on page
8-4.
Minimum ignition spark gap
6.0 mm (0.24 in)
TIP
If the ignition spark gap is within specification,
the ignition system circuit is operating normally.
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a. Remove the ignition coil from the spark plug.
b. Connect the ignition checker "1" as shown.
Ignition checker
90890-06754
Oppama pet–4000 spark checker
YM-34487
8-200
1