Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 150Get this manual

Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 150

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INSP ADJ

Compression pressure (With oil applied into cylinder) Reading Higher than without oil Same as without oil Diagnosis Worn or damaged pistons ReplacePossible defective ring(s), val