Troubleshooting Charts - Yamaha wr450fb Owner's Manual

PERIODIC MAINTENANCE AND ADJUSTMENT

Troubleshooting charts

Starting problems or poor engine performance
1
1. Fuel
2
Check the fuel level in
the fuel tank.
3
2. Compression
4
Operate the electric starter
5
or the kickstarter.
6
3. Ignition
7
Remove the spark plug
and check the electrodes.
8
4. Battery
9
Operate the electric starter.
There is enough fuel. Check the compression.
There is no fuel.
Supply fuel.
There is compression. Check the ignition.
Have a Yamaha dealer
There is no compression.
check the vehicle.
Wipe off with a dry cloth and correct the
Wet
spark plug gap, or replace the spark plug.
Have a Yamaha dealer check the vehicle.
Dry
The engine turns over
The battery is good.
quickly.
Check the battery lead connections,
The engine turns over
and have a Yamaha dealer charge
slowly.
the battery if necessary.
7-40
The engine does not start.
Check the compression.
Operate the electric starter or the
kickstarter.
The engine does not start.
Check the battery.
The engine does not start.
Have a Yamaha dealer
check the vehicle.
EAU53121