2008 YAMAHA WR 450F fuel

7-3
IGNITION SYSTEM
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 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.
*1 Check fuse. No good→Replace fuse and check wire harness.
OK↓
*2 Check battery. No good→Recharge or replace.
OK↓
Spark gap test Spark→*3 Clean or replace spark plug.
No spark↓
Check entire ignition system for connection.
(couplers, leads and ignition coil)No good→
Repair or replace.
OK↓
Check engine stop switch. No good→Replace.
OK↓
Check main switch. No good→Replace.
OK↓
Check ignition coil. (primary coil and secondary
coil)No good→
Replace.
OK↓
Check AC magneto. (pickup coil) No good→Replace.
OK↓
Check neutral switch. No good→Repair or replace.
OK↓
Replace CDI unit.
Dynamic spark tester:
YM-34487
Ignition checker:
90890-06754
Pocket tester:
YU-3112-C/90890-03112

7-13
CHARGING SYSTEM
CHARGING SYSTEM
INSPECTION STEPS
If the battery is not charged, use the following inspection steps.
*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.
• Remove the following parts before inspection.
1. Seat
2. Fuel tank
• Use the following special tools in this inspection.
*1 Check fuse. No good→Replace fuse and check wire harness.
OK↓
*2 Check battery. No good→Recharge or replace.
OK↓
Check each coupler and wire connection. No good→Repair or replace.
OK↓
Check charging voltage. OK→Charging system is good.
No good↓
Check AC magneto. (Charging coil) No good→Replace.
OK↓
Replace rectifier/regulator.
Pocket tester:
YU-3112-C/90890-03112

7-18
LIGHTING SYSTEM
LIGHTING SYSTEM
INSPECTION STEPS
Refer to the following flow chart when inspecting the lighting system for possible problems.
• Remove the following parts before inspection.
1. Seat
2. Fuel tank
3. Left side cover
• Use the following special tools in this inspection.
Check the bulb and bulb socket. No good→Replace the bulb and/or bulb socket.
OK↓
Check the taillight (LEDs). No good→Replace the taillight assembly.
OK↓
Check the AC magneto. (Lighting coil) No good→Replace.
OK↓
Check the entire lighting system proper for con-
nections.Improperly
connected→Repair or replace.
OK↓
Check the rectifier/regulator. (Out-put voltage) No good→Replace.
Pocket tester:
YU-3112-C/90890-03112