I have a 1994 150 hp Yamaha outboard motor with tilt-trim. My motor is stuck in the up tilt position and will not tilt down. It is working when I go up, but not down. I have talked to a used parts dealer and a tilt-trim replacement is $425. I also need to know how to install the replacement. How do I remove the pin that goes through the tilt piston? Help!

Stop! Dont replace the pump...I would bet that it is the "down" Solenoid that went haywire. I would begin by replacing the Down solenoid...it is a far easier and cheaper fix and if your pump works to raise the engine then that tells me that it is not faulty. The Down solenoid looks just like a starter solenoid and the one that you are looking to replace has a GREEN wire to it. Yellow with a red stripe is for the starter. Blue wire is the up solenoid. So replace the one with the green wire going to it and I bet it will fix your problem.