Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 84Get this manual

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INSP ADJ
(with spark plug cleaner or wire brush) Spark plug type (NGK): B6HSBR6HS

4 Measure: 9 Spark plug gap Out of specification Regap Use wire gaugeSpark plug gap: 0.60.7 mm (0.0

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