Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 138Get this manual

Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 138

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GENERAL 4 Measure: Spark plug gap Out of specification

5 Tighten: Spark plug Spark plug: 25 (2.5 kgf m, 18.4 ft lb)

Before installing the spark plug, clean the gasket surface