2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 246Get this manual
Starter motor (electric starter model)
Removing the starter motor
1Remove the starter motor from the power unitNOTE: Check the engine start switch or engine start button, neutral switch, starter relay, and fuse before removing the starter motor To remove the starter motor, see "Bracket (electric starter model)" (5-24)
WARNING
Do not place any objects near the pinion or touch itThe pinion moves slightly away from the starter motor body and rotates at high speedNOTE: Check the starter motor operation for few seconds If the starter motor is disassembled for maintenance, be sure to check the operation again after assembling it4Disconnect the negative battery cable and positive battery cable from the battery terminals
Checking the starter motor operation
1Hold the starter motor in vise using aluminum plates on both sides2Connect the positive battery cable to the starter relay terminal 2, connect the starter motor lead to the starter motor positive terminal 4, and connect the negative battery cable to the starter motor body 63Connect the starter relay lead (brown) to the positive battery terminalConnect the starter relay lead (black) to the negative battery terminal to check the starter motor operation