2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 127Get this manual
Power unit
Removing the cylinder head
1Remove the cylinder head cover
2Remove the cylinder head bolts in the sequence shown
S6AG5160
S6AG5140
CAUTION:
Do not scratch or damage the mating surfaces of the cylinder head and cylinder block
NOTE: Loosen the locknut and adjust screw to slack off the tension, before remove the rocker arm shaft Be sure to keep the parts in the order as they were removed3Remove the camshaft 7, and then remove the oil seal 8