Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 74Get this manual
INSP ADJ
POWER UNIT
Valve clearance NOTE: Adjust valve clearance, at room temperature, when piston is near T.D.Cin compression process1Remove: 9Top cowling 9Bolt (carrying handle) 9Carrying handle (protector) 9Bottom cowling 9Bolt (recoil starter) 9Recoil starter ass'y 9Spark plug 2Remove: 9Bolt (cylinder head cover) 9Cylinder head cover 9Gasket (cylinder head cover)
3Position: