Honda Outboards BF40A/BF50A Service Manual, Page 407Get this manual
BF40A-BF50A 3) Remove the down relief valve:valvg springspring guide- steel ball- down relief valve seat-O-ringReplace the O-ring with new one during reassemblyBALL
VALVE SPRtNG UPPER CHAMBER
SPRING GUIDE
4) Remove the upper chamber safety valve
Remove O-ring from the upper chamber safety valve and discard itReplace the O-ring with new one during reassembly
[7] DOWN RELIEF VALVE
[6] DOWN RELIEF