Checking The Ignition Spark Gap; Checking The Ignition Coil - Yamaha WR250R Service Manual

c. Check the diode for continuity.
d. Check the diode for no continuity.
7 6
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EAS28930

CHECKING THE IGNITION SPARK GAP

1. Check:
Ignition spark gap
G
Out of specification → Perform the ignition
system troubleshooting, starting with step *.
Refer to "TROUBLESHOOTING" on page
8-3.
Minimum ignition spark gap
6.0 mm (0.24 in)
NOTE:
If the ignition spark gap is within specification,
the ignition system circuit is operating normally.
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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
Opama pet-4000 spark checker
YM-34487
1. Ignition checker
2. Spark plug cap
3 4 1 5 2
8-74
ELECTRICAL COMPONENTS
c. Turn the main switch to "ON" and 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 un-
til a misfire occurs.
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EAS28090

CHECKING THE IGNITION COIL

1. Check:
Primary coil resistance
G
Out of specification → Replace.
Primary coil resistance
1.19–1.61 Ω
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a. Disconnect the ignition coil lead coupler from
wire harness.
b. Connect the pocket tester (Ω × 1) to the igni-
tion coil as shown.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
Tester positive probe
Red/Black termainal "1"
Negative tester probe
Orange terminal "2"
c. Measure the primary coil resistance.
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2. Check:
Secondary coil resistance
G
Out of specification → Replace.