Honda BF35A-BF45A Outboard Motors Shop Manual., Page 230Get this manual
GAS ASSISTED SYSTEM Gas assisted tilt type
Description of each part
Tilt lever
111 Check valve
Check valve push rod: Openscloses the check valve raisellower the piston
1111 Nitrogen gas chamber
1101 Oil chamber II
Free piston
Change valve cam: Switches "LOCK'or "FREE"