Yamaha NMAX 2016 - Troubleshooting Charts

Periodic maintenance and adjustment
6-40
6
EAU68020
Troubleshooting charts
Starting problems or poor engine performance
1. Fuel
There is enough fuel.
There is no fuel.
Check the battery.
Supply fuel.
The engine turns over
quickly.
The engine turns over
slowly.
Operate the electric
starter.
The engine does not
start.
Check the battery.
Wipe off with a dry
cloth and correct the
spark plug gap, or
replace the spark
plug.
Check the battery
lead connections,
and have a Yamaha
dealer charge the
battery if necessary.
2. Battery
The battery is good.
The engine does not
start.
Check the ignition.
3. Ignition
Wet
Dry
There is compression.
There is no
compression.
The engine does not start.
Have a Yamaha dealer check the vehicle.
Have a Yamaha dealer check the vehicle.
The engine does not
start.
Check the
compression.
Have a Yamaha
dealer check the
vehicle.
Remove the spark
plug and check
the electrodes.
Operate the electric
starter.
Operate the electric
starter.
Check the fuel level
in the fuel tank.
4. Compression
UBV3E0E0.book Page 40 Monday, September 26, 2016 3:42 PM