Troubleshooting Chart - Yamaha YZ85M 2021 Owner's Manual

Periodic maintenance and adjustment

Troubleshooting chart

1. Fuel
Check the fuel level
in the fuel tank.
2. Ignition
Remove the spark
plug and check
the electrodes.
3. Compression
Try starting the
engine.
There is enough fuel.
There is no fuel.
Wet
Dry
There is compression.
There is no
compression.
7-32
Check the ignition.
Supply fuel.
Wipe off with a dry
cloth and correct the
spark plug gap, or
replace the spark
plug(s).
Have a Yamaha
dealer check the
vehicle.
The engine does not start.
Have a Yamaha dealer check the vehicle.
Have a Yamaha dealer check the vehicle.
EAU86410
The engine does not
start.
Check the ignition.
Open the throttle
halfway and try
starting the engine.
The engine does not
start.
Check the
compression.
7