2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 313Get this manual
Yamaha Diagnostic System Sparking ignition coil procedure: voltage is applied to the ignition coil of the selected cylinder, spark is created in the spark gap tester, and then the ignition system is checkedFive sparks are created within five seconds
WARNING
Do not touch any connections of the spark gap tester lead wires Do not let sparks leak out of the removed spark plug cap Keep flammable gas or liquids away since this test will produce sparks1Select the test that you wish to perform by either clicking it or pressing the up or down arrow keys on your keyboard(Fig22) NOTE: Make sure that the engine is not running The selected item is highlighted in light blue The details of the selected test are displayed in the column on the right, and the items that must be either checked or performed before the test can start are displayed below the table Only one item can be selected at one time special tool (spark gap tester YM-34487) is needed2Connect the spark plug cap of the cylinder that will be tested to the spark gap testerSpark gap tester YM-34487 3Set the spark gap length on the adjusting knobIgnition spark gap: mm (0.4 in)