Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 290Get this manual

Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 290

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IGNITION SYSTEM

1 Remove: 9 Spark plug cap 2 Disconnect: 9 Ignitor ass'y lead (W) 3 Measure: 9 Ignitor ass'y output peak voltage Below specification Replace the or check the ignitor ass'y