Yamaha F100B F100C Outboards Factory Service Manual, Page 330Get this manual
TRBL SHTG
Troubleshooting
Symptom: Engine can run, but engine speed will not increaseOverheat warning indicator is onOil pressure warning indicator is onWarning indicator is on and buzzer is sounding Check the water cooling system Check the lubricating system(Cooling system) Check the water inlet for clogs or debrisCheck that cooling water is discharged from the pilot water outlet