Yamaha MBK X-MAX 300 2017 Service Manual page 437

C
6
5
A. Diode 1
B. Diode 2
C. Diode 3
a. Disconnect the diode from the wire har-
ness.
b. Connect the digital circuit tester to the di-
ode terminals.
c. Check the diode for continuity.
d. Check the diode for no continuity.
EAS30556
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
8-3.
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.
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
Br/W
R/W
ELECTRICAL COMPONENTS
2. Ignition coil
c. Turn the main switch to "ON".
d. Measure the ignition spark gap "a".
e. Crank the engine by " " side of the start/
engine stop switch is pushed and gradual-
ly increase the spark gap until a misfire oc-
curs.
EAS30557
CHECKING THE SPARK PLUG CAP
1. Check:
• Spark plug cap resistance
Out of specification → Replace.
Resistance
3.75–6.25 kΩ
a. Remove the spark plug cap from the spark
plug lead.
b. Connect the digital circuit tester to the
spark plug cap as shown.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
YU-A1927
c. Measure the spark plug cap resistance.
EAS30558
CHECKING THE IGNITION COIL
1. Check:
• Primary coil resistance
Out of specification → Replace.
8-132