Yamaha F50F Service Manual page 291

Out of specification?
No
Check the ignition system, fuel
system, or cooling system.
Cooling system
Check the cooling water pas-
sage for debris or leaks.
Debris or leaks?
No
Check the thermostat.
Good condition?
Yes
Check the cooling water tem-
perature sensor resistance.
Continued on next page.
6C13G11
Yes
Check the oil pump for debris or
oil leaks.
Debris or leaks?
Yes
Clean or replace the defective
parts.
Yes
Clean or replace the cooling
water passage.
No
Replace the thermostat.
Power unit
No Check the oil
passage.
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