Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 292Get this manual

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IGNITION SYSTEM
SPARK PLUG
Refer to "GENERAL" in chapter 3
SPARK PLUG CAP (WITH RESISTER)
1 Inspect: 9 Spark plug cap Loose TightenCracksdamage Replace2 Remove: 9 Spark plug ca

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