Troubleshooting - Yamaha YP250R 2005 Service Manual

EAS00736

TROUBLESHOOTING

The ignition system fails to operate (no
spark or intermittent spark).
Check:
1. main, ignition, and CDI unit fuses
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. sidestand switch
10.wiring connections (of the entire ignition
system)
NOTE:
_
• Before troubleshooting, remove the following
part(s):
1. storage box
2. front cowling
3. storage compartment
4. footrest board
• Troubleshoot with the following special
tool(s).
Ignition checker
90890-06754
Pocket tester
90890-03112
EAS00738
1. Main, ignition, and CDI unit fuses
• Check the main, ignition, and CDI unit
fuses for continuity.
Refer to "CHECKING THE FUSES" in
chapter 3.
• Are the main, ignition, and CDI unit fuses
OK?
YES
NO
Replace the fuse(s).
IGNITION SYSTEM
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
DR8EA (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?
8 - 8
ELEC
YES
• Clean the battery
terminals.
• Recharge or
replace the battery.
YES
Regap or replace the
spark plug.
– +
NO
NO