Checking The Ignition Spark Gap; Checking The Spark Plug Cap; Checking The Ignition Coil - Yamaha WR450FB 2012 Owner's Service Manual

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EAS28930

CHECKING THE IGNITION SPARK GAP

1. Check:
• Ignition spark gap
Out of specification
system troubleshooting, starting with step 4.
Refer to "TROUBLESHOOTING" on page 9-
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 spark plug cap from the spark
plug.
b. Connect the ignition checker "1" as shown.
Ignition checker
90890-06754
Oppama pet-4000 spark checker
YM-34487
2. Spark plug cap
c. Turn the engine stop switch to " ".
d. Measure the ignition spark gap "a".
e. Crank the engine by pushing the start switch
" " and gradually increase the spark gap
until a misfire occurs.
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3
1
Perform the ignition
9-71
ELECTRICAL COMPONENTS
EAS1DX3233

CHECKING THE SPARK PLUG CAP

1. Remove:
• Spark plug cap
(from the spark plug lead)
2. Check:
• Spark plug cap resistance
Out of specification
Spark plug cap resistance
10 kW
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a. Connect the pocket tester (
spark plug cap as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
b. Measure the spark plug cap resistance.
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EAS1DX3234

CHECKING THE IGNITION COIL

1. Disconnect
• Ignition coil coupler
(from the wire harness)
• Spark plug cap
(from the ignition coil)
2. Check:
• Primary coil resistance
Out of specification
Primary coil resistance
3.57-4.83
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a. Connect the pocket tester (
tion coil as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Replace.
1k) to the
Replace.
1) to the igni-