Honda Outboards BF40A/BF50A Service Manual, Page 230Get this manual
HONDABF315A -4!5A
GAS ASSISTED SYSTEM
Gas assisted tilt type
[2] Tilt lever
Description of each part
.Check valve
[11Nitrogen gas chamber
,._ .L_ ""'""CIl VIIIVe::
Openscloses the check valve