Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 246Get this manual

Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 246

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DRIVE SHAFT, FORWARD GEAR AND SHIFT ROD E

PittingRumbling ReplaceLower case inspection 1 Clean: 9 Lower case Use soft brush and solvent2 Inspect: 9 Water passage Mineral depositsCorrosion