Checking The Ignition Coil; Checking The Crankshaft Position Sensor - Yamaha WR450F Owner's Service Manual
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Also See for WR450F:
- Owner's manual (98 pages) ,
- Supplementary owner's service manual (28 pages) ,
- Owner's service manual (795 pages)
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a. Connect the pocket tester ( 1k) to the
spark plug cap.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
b. Measure the spark plug cap resistance.
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CHECKING THE IGNITION COIL
EAS2GC1391
1. Disconnect:
• Ignition coil terminal
(from the sub wire harness)
• Spark plug cap
(from the ignition coil)
2. Check:
• Primary coil resistance
Out of specification Replace.
Primary coil resistance
2.16–2.64
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a. Connect the pocket tester ( 1) to the igni-
tion coil.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
Ignition coil terminal 1 "1"
• Negative tester probe
Ignition coil terminal 2 "2"
ELECTRICAL COMPONENTS
b. Measure the primary coil resistance.
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3. Check:
• Secondary coil resistance
Out of specification Replace.
Secondary coil resistance
8.64–12.96 k
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a. Connect the pocket tester ( 1k) to the ig-
nition coil.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe
Ignition coil terminal 1 "1"
• Negative tester probe
Spark plug lead "2"
b. Measure the secondary coil resistance.
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CHECKING THE CRANKSHAFT POSITION
EAS2GC1392
SENSOR
1. Disconnect:
• Crankshaft position sensor coupler
(from the wire harness)
2. Check:
• Crankshaft position sensor resistance
Out of specification Replace.
9-74
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