Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 268Get this manual
RESERVOIR AND POWER TRIM AND TILT MOTOR (200H, 225GV200, V225)
(10) After measuring the hydraulic pressure, connect the leads on the battery terminals in the up position until the power trim and tilt ram assemblies are fully extended(11) Remove the special tools(12) Install the manual valve and circlip7280