Troubleshooting - Yamaha YZ450F(E) 2014 Owner's Service Manual

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TROUBLESHOOTING

The ignition system fails to operate (no spark or intermittent spark).
TIP
Before troubleshooting, remove the following part(s):
1. Side cover (left/right)
2. Seat
3. Fuel tank
4. Air scoop (left/right)
5. Air filter case cover
1. Check the ignition system wire har-
ness connections.
OK 
2. Check the spark plug.
Refer to "CHECKING THE SPARK
PLUG" on page 3-35.
OK 
3. Check the ignition spark gap.
Refer to "CHECKING THE IGNI-
TION SPARK GAP" on page 8-41.
NG 
4. Check the ignition coil.
Refer to "CHECKING THE IGNI-
TION COIL" on page 8-41.
OK 
5. Check the engine stop switch.
Refer to "CHECKING THE
SWITCHES" on page 8-38.
OK 
6. Check the crankshaft position sen-
sor.
Refer to "CHECKING THE CRANK-
SHAFT POSITION SENSOR" on
page 8-42.
OK 
7. Check the stator coil.
Refer to "CHECKING THE STA-
TOR COIL" on page 8-43.
OK 
NG 
Reconnect.
NG 
Correct or replace the spark plug.
OK 
The ignition system circuit is OK.
NG 
Replace the ignition coil.
NG 
Replace the engine stop switch.
NG 
Replace the crankshaft position sensor.
NG 
Replace the stator coil.
8-4
IGNITION SYSTEM

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