Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 88Get this manual

Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 88

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INSP ADJ
Diagnosis Worn or damaged pistons Possible defective ring(s), valves, cylinder head gasket or piston Repair
Grease points 1 Apply: 9 Water resistant grease Refer the illustration