Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 146Get this manual

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INSP ADJ
1 Spark plugs 1 Remove: Spark plug 2 Check: Spark plug type Spark plug type (NGK): DPR6EA-9

3 Inspect: Electrodes Cracksexcessive wear Replace9 Insulator color Distinctly d

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