Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 283Get this manual
TILT CYLINDER, RESERVOIR AND POWER TRIM AND TILT MOTOR (225F, L225F, 250B, L250BS225, L225, S250, L250)
WARNING
To prevent the hydraulic fluid from spurting out due to internal pressure, the outboard should be kept fully tilted up (the tilt rod at full length) After removing the power trim and tilt motor or reservoir, do not push the tilt ram downThis may cause hydraulic fluid to spurt out from the port