Yamaha WR450F Owner's Service Manual page 341

8. Check the main relay.
Refer to "CHECKING THE RE-
LAYS" on page 9-72.
OK 
9. Check the neutral switch.
Refer to "CHECKING THE
SWITCHES" on page 9-64.
OK 
10.Check the clutch switch.
Refer to "CHECKING THE
SWITCHES" on page 9-64.
OK 
11.Check the engine stop switch.
Refer to "CHECKING THE
SWITCHES" on page 9-64.
OK 
12.Check the start switch.
Refer to "CHECKING THE
SWITCHES" on page 9-64.
OK 
13.Check the entire starting system's
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 9-6.
OK 
Replace the ECU.
ELECTRIC STARTING SYSTEM
NG 
Replace the main relay.
NG 
Replace the neutral switch.
NG 
Replace the clutch switch.
NG 
Replace the engine stop switch.
NG 
Replace the start switch.
NG 
Properly connect or repair the starting sys-
tem's wiring.
9-11