2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 276Get this manual
Electrical systems
WARNING
Do not touch any of the connections of the spark gap tester leads Do not let sparks leak out of the removed spark plug caps Keep flammable gas or liquids away, since this test can produce sparks
Checking the ignition spark gap
1Remove the ignition coil cover and disconnect the spark plug caps from the spark plugs2Connect spark plug cap to the special service tool
Ignition spark gap: 11 mm (0.43 in)
Checking the ignition coil
1Remove the spark plug wires from the spark plugsS69J8110