Troubleshooting - Yamaha MIO Service Manual

EAS00736

TROUBLESHOOTING

The ignition system fails to operate (no
spark or intermittent spark).
Check:
1. fuse
2. battery
3. spark plug
4. ignition spark gap
5. spark plug cap resistance
6. ignition coil resistance
7. pickup coil resistance
8. main switch
9. wiring connections (of the entire ignition
system)
NOTE:
_
• Before troubleshooting, remove the following
part(s):
1. seat
2. center cover
3. rear panel
4. right side cover
5. headlight assembly
• Troubleshoot with the following special
tool(s).
Ignition checker
90890-06754
Pocket tester
90890-03112
IGNITION SYSTEM
EAS00738
1. Fuse
• Check the fuse for continuity.
Refer to "CHECKING THE FUSE" in chap-
ter 3.
• Is the fuse OK?
EAS00739
2. Battery
• Check the condition of the battery.
Refer to "CHECKING AND CHARGING
THE BATTERY" in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20 °C (68 °F)
• Is the battery OK?
EAS00740
3. Spark plug
• Check the condition of the spark plug.
• Check the spark plug type.
• Measure the spark plug gap.
Refer to "CHECKING THE SPARK PLUG"
in chapter 3.
Standard spark plug
C7HSA(NGK)
Spark plug gap
0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
• Is the spark plug in good condition, is it of
the correct type, and is its gap within spec-
ification?
7 - 11
ELEC
YES
Replace the fuse.
YES
• Refill battery fluid.
• Clean the battery
terminals.
• Recharge or
replace the battery.
YES
Re-gap or replace
the spark plug.
– +
NO
NO
NO