Yamaha F50A - Page 135

62Y3A11
5-8
1
2
3
4
5
6
7
8
I
Symptom: Engine can run, but engine speed will not increase.
Overheat warning indicator is on.
Oil pressure warning indicator is on.
Warning indicator is on and buzzer is sounding.
• Check the water cooling system.
• Check the lubricating system.
Check the water inlet for clogs
or debris.
Check the thermoswitch.
Check that cooling water is dis-
charged from the pilot water
outlet.
Replace the thermostat.
Replace the CDI unit.
Replace the thermoswitch.
Check the water
pump impeller.
Check the water
passage.
Clogs or
debris?
Is water dis-
charged?
Good condi-
tion?
Good condi-
tion?
Good condi-
tion?
Clean the water inlet.
Yes
No
No
Yes
Yes
Yes
No
No
Check the thermostat operation.
Replace the impel-
ler.
No
Yes
Troubleshooting