Checking The Ignition Spark Gap - Yamaha SR400 2014 Service Manual

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
orange "1"
• Negative tester probe
red/white "2"
c. Measure the primary coil resistance.
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2. Check:
• Secondary coil resistance
Out of specification  Replace.
Secondary coil resistance
8.64–12.96 k
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a. Disconnect the spark plug cap from the igni-
tion coil.
b. Connect the pocket tester (  1k) to the ig-
nition coil as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Negative tester probe
red/white "1"
• Positive tester probe
Ignition coil spark plug lead "2"
ELECTRICAL COMPONENTS
c. Measure the secondary coil resistance.
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EAS28930

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
7-5.
Minimum ignition spark gap
6.0 mm (0.24 in)
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a. Disconnect 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
1. Ignition checker
2. Spark plug cap
c. Turn the main switch to "ON".
d. Measure the ignition spark gap "a".
e. Crank the engine and gradually increase the
spark plug gap until a misfire occurs.
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