Honda Outboards BF40A/BF50A Service Manual, Page 404Get this manual
BF40A-BF50A 6) Remove the outer tube guide using the lock nut wrenchRemove the a-rings from the outer tube guide and discard themReplace the a-rings with new ones during reassembly
[1] LOCK NUT WRENCH 070PA-ZW40100
[2] OUTER TUBE GUIDE
[3] O-RINGS
Do not reuse
7) Remove the valve body and cylinder assembly from the vise8) Remove the cylinderpiston assembly from the valve body, and drain ATF from the cylinder assembly and valve body9) Remove the a-ring from the bottom piece and discard itReplace the a-ring with new one during reassembly