Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 172Get this manual
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POWR BREATHER VALVE
M6 12 mm Nm (0.8mkg, 5.8 ftlb) 7
REMOVAL AND INSTALLATION CHART
Step ProcedurePart name BREATHER VALVE REMOVAL Bolt with washer (breather cover) Breather c