
PERIODIC MAINTENANCE AND MINOR REPAIR
EAU03363
Troubleshooting charts
Starting problems or poor engine performance
EW000125
Keep away open flames and do not smoke while checking or working on the fuel system.
1. Fuel
Check the fuel level in
the fuel tank.
There is enough fuel.
Check the compression.
There is no fuel.
Supply fuel.
Check the compressoin.
2. Compression
Operate the electric starter.
There is compression.
Check the ignition.
There is no compression.
Have a Yamaha dealer
check the vehicle.
3. Ignition
Remove the spark plugs
and check the electrodes.
Wipe off with a dry cloth and correct the
spark plug gaps, or replace the spark plugs.
Have a Yamaha dealer check the vehicle.
Open the throttle halfway and operate
the electric starter.
The engine does not start.
Check the battery.
4. Battery
The engine turns over
The battery is good.
I
quickly.
Operate the electric starter.
The engine turns over
slowly.
Check the electrolyte and battery
lead connections, and charge the
battery if necessary.
6-46
The engine does not start.
Have a Yamaha dealer
check the vehicle.
Summary of Contents for Vmax VMX12N
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