Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 288Get this manual

Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 288

IGNITION SYSTEM
SERVICE POINTS
IGNITION SPARK GAP

9When checking the spark gap, do not touch any of the connections of the spark gap tester lead wires9When performing the spark gap test, take special care not to let sparks leak out of the removed spark plug cap9When performing the spark gap check, keep flammable gas or liquids away, since this test can produce sparks1Check:

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