2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 265Get this manual
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Troubleshooting
Troubleshooting the power unit
NOTE: Before troubleshooting the outboard motor: Make sure that fresh fuel of the specified type has been used Make sure that the battery is fully charged Be sure to check that the couplers, connectors, and battery terminals are securely connected Check the CDI unit circuitTo check the CDI unit circuit, see "Checking the CDI unit" (8-25) Perform the troubleshooting as described in the following tables When checking the input voltage of part, the coupler or connector must be disconnectedHowever, be careful not to short-circuit the wiring harness
Troubleshooting the power unit
Troubleshooting consists of the following itemsSymptom 1: Specific trouble conditions Symptom 2: Trouble conditions of an area or individual part Cause 1: The content considered as the trouble causes of symptom 2Cause 2: The content considered as the trouble causes of cause (described if necessary)Symptom 1: Engine does not crank (manual starter model) Symptom Starter rope does not operate Cause Shift lever not in the neutral position Start-in-gear protection cable not adjusted correctly Manual starter malfunction Stuck piston Piston lock due to water or oil in the combustion chamber Stuck drive shaft Salt buildup on the drive shaft and bushing Malfunction of the lower unit internal parts Starter rope operates, but the engine does not crank Manual starter malfunction Cause Checking step Set the shift lever to the neutral positionAdjust the start-in-gear protection cableDisassemble and check the manual starterDisassemble and check the power unitRefer to page 3-9 3-11