Troubleshooting Charts - Yamaha Vmax VMX12N Owner's Manual

Troubleshooting charts

Starting problems or poor engine performance
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.
2. Compression
Operate the electric starter.
3. Ignition
Remove the spark plugs
and check the electrodes.
4. Battery
Operate the electric starter.
PERIODIC MAINTENANCE AND MINOR REPAIR
Wipe off with a dry cloth and correct the
spark plug gaps, or replace the spark plugs.
Have a Yamaha dealer check the vehicle.
The engine turns over
quickly.
I
The engine turns over
slowly.
Check the compression.
Check the compressoin.
Have a Yamaha dealer
check the vehicle.
The battery is good.
Check the electrolyte and battery
lead connections, and charge the
battery if necessary.
6-46
EAU03363
EW000125
Open the throttle halfway and operate
the electric starter.
The engine does not start.
Check the battery.
The engine does not start.
Have a Yamaha dealer
check the vehicle.