Yamaha F50F Service Manual page 290

TRBL
SHTG
Cracks or damage?
No
Check the vapor separator nee-
dle valve.
Is the needle valve
bent or worn?
No
Check the ignition system, lubri-
cation system, or cooling sys-
tem.
Lubrication system
Check the engine oil level.
At specified level?
Yes
Check the oil pressure switch.
Good condition?
Yes
Check the oil pressure.
Continued on next page.
9-17
Troubleshooting
Yes
Replace the diaphragm.
Yes
Replace the needle valve.
No
Add engine oil to the correct
level.
No
Replace the oil pressure switch.
6C13G11