1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 77Get this manual
AND TILT (PTT) SYSTEM
2Fill: PTT unit Recommended PIT fluid: ATF Oexron II PIT fluid level check bolt: Nm (0.7 kg m, 5.1 ft Ib)
Hydraulic system air bleeding NOTE: The PTT unit cannot be bled manuallyThe power tilt must be operated during the bleeding procedure1Bleed: Air Bleeding steps: Turn the manual valve counterclockwise until it is fully closed Connect the battery leads to the battery Push the PTT switch so that the tilt rod moves up and downPIT switch UP ON Direction Tilt up Tilt down