Yamaha YZ250 2022, Owner'S Service Manual

Page: 235 / 274

ELECTRICAL COMPONENTS
8-8
EAM30294
CHECKING THE IGNITION SPARK GAP
1. Check:
•
Ignition spark gap
Out of specification

Perform the ignition
system troubleshooting, starting with step (3).
Refer to “TROUBLESHOOTING” on page
8-2.
TIP
If the ignition spark gap is within specification,
the ignition system circuit is operating normally.
a. Disconnect the spark plug cap from the
spark plug.
b. Connect the ignition checker “1” as
shown.
c. Kick the kickstarter crank.
d. Measure the ignition spark gap “a”.
e. Crank the engine and gradually increase
the spark gap until a misfire occurs.
EAM30295
CHECKING THE SPARK PLUG CAP
1. Remove:
•
Spark plug cap
(from the high tension cord)
2. Check:
• Spark plug cap resistance
Out of specification

Replace.
a. Connect the digital circuit tester (

) to the
spark plug cap.
b. Measure the spark plug cap resistance.
EAM30296
CHECKING THE IGNITION COIL
1. Check:
• Primary coil resistance
Out of specification

Replace.
a. Disconnect the ignition coil connectors
from the ignition coil terminals.
b. Connect the digital circuit tester (

) to the
ignition coil as shown.
Minimum ignition spark gap
6.0 mm (0.24 in)
Ignition checker
90890-06754
Oppama pet–4000 spark checker
YM-34487
2. Spark plug cap
Resistance
5.00–6.00 k

G089048
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe

High tension cord terminal “1”
• Negative tester probe

High tension cord terminal “2”
Primary coil resistance
0.20–0.30

Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
•
Positive tester probe

Yellow “1”
•
Negative tester probe

Black “2”
2
1