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

4
$
5
~
~
1
EAS28930 ·
CHECKING THE IGNITION SPARK GAP
1. Check:
• Ignition spark gap
Out of specification
~
Perform the ignitlon
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.
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
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
VM-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
"(i)"
and gradu·a11y increase the spark gap
until a misfire occurs.
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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
~
Replace.
Spark plug cap resistance
10kW
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
a. Connect the pocket tester (Qx 1 k) to the
spark plug cap as shown. ·
Pocket tester
90890-03112
Analog pocket tester
VU-03112-C
b. Measure the spark plug cap resistance.
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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
~
Replace.
Primary coil resistance
3.57-4.83
Q
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
a. Connect the pocket tester (Ox 1) to the igni-
tion coil as shown .
Pocket tester
90890-03112
Analog pocket tester
VU-03112-C