Yamaha VMX EAU10041 - Manual (Page 80)

PERIODIC MAINTENANCE AND MINOR REPAIR
6-40
6
EAU25941
Troubleshooting charts
Starting problems or poor engine performance
WARNING
EWA10840
Keep away open flames and do not smoke while checking or working on the fuel system.
Check the fuel level in
the fuel tank.
1. Fuel
There is enough fuel.
There is no fuel.
Check the compression.
Supply fuel.
Operate the electric starter.
2. Compression
There is compression.
There is no compression.
Check the ignition.
Have a Yamaha dealer
check the vehicle.
Remove the spark plugs
and check the electrodes.
3. Ignition
Wet
Dry
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 does not start.
Check the battery.
Open the throttle halfway and operate
the electric starter.
Operate the electric starter.
4. Battery The engine turns over
quickly.
The engine turns over
slowly.
The battery is good.
Check the electrolyte and battery
lead connections, and charge the
battery if necessary.
The engine does not start.
Have a Yamaha dealer
check the vehicle.
The engine does not start.
Check the compressoin.
U5GK15E0.book Page 40 Tuesday, April 13, 2004 3:52 PM