Ignition System; Inspection Steps - Yamaha WR450F(Y) 2009 Owner's Service Manual

IGNITION SYSTEM

INSPECTION STEPS

Use the following steps for checking the possibility of the malfunctioning engine being attributable to ignition system failure
and for checking the spark plug which will not spark.
*1 Check fuse.
OK ↓
*2 Check battery.
OK ↓
Spark gap test
No spark ↓
Check entire ignition system for connection.
(couplers, leads and ignition coil)
OK ↓
Check engine stop switch.
OK ↓
Check main switch.
OK ↓
Check ignition coil. (primary coil and secondary
coil)
OK ↓
Check AC magneto. (pickup coil)
OK ↓
Check neutral switch.
OK ↓
Replace CDI unit.
*1 marked: Refer to "CHECKING THE FUSE" section in the CHAPTER 3.
*2 marked: Refer to "CHECKING AND CHARGING THE BATTERY" section in the CHAPTER 3.
*3 marked: Only when the ignition checker is used.
• Remove the following parts before inspection.
1. Seat
2. Fuel tank
• Use the following special tools in this inspection.
Dynamic spark tester:
YM-34487
Ignition checker:
90890-06754
Pocket tester:
YU-3112-C/90890-03112
No good → Replace fuse and check wire harness.
No good → Recharge or replace.
Spark → *3 Clean or replace spark plug.
No good →
Repair or replace.
No good → Replace.
No good → Replace.
No good →
Replace.
No good → Replace.
No good → Repair or replace.
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IGNITION SYSTEM