Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 298Get this manual
TRBL ANLS NOTE:
TROUBLE ANALYSIS
TROUBLE ANALYSIS
The following items should be checked before the "Trouble analysis" chart is consulted1.The battery is charged and its specified gravity is within specification2.There are no incorrect wiring connections3.Wiring connections are properly secured and are not rusty4.The lanyard is attached to the engine stop switch5.The shift position is in neutral6.Fuel is reaching the carburetor7.The rigging and engine settings are correct8.The engine is free from any "Hull problem"
TROUBLE ANALYSIS CHART