1998 Yamaha 25J, 30D, 25X, 30X outboards Factory Service Manual, Page 161Get this manual

1998 Yamaha 25J, 30D, 25X, 30X outboards Factory Service Manual, Page 161

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IGNITION SYSTEM

checking the spark gap, do not touch any of the connections of the spark gap tester lead wiresWhen performing the spark gap test, take special care not to let sparks leak