Check this thread on removing the tilt trim from your 1998 50hp Johnson motor: https://www.thehulltruth.com/boating-forum/490732-1998-johnson-50-hp-trim-tilt-repair.html
SOURCE: tilt-trim not tilting down after being tilted all the way up
check the solinoid you should have two,one for up and one for down,you can test by putting a screwdriver on both neg and pos contacts at same time,if thats not it check to make sure nothing came unpluged
SOURCE: I have a 1994 150 hp Yamaha outboard motor with
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.
SOURCE: how to service a tilt/trim on a 50 hp yamaha
To check the fluid level, tilt the motor up and engage the tilt lock lever. Open the bolt on top of the tilt/trim reservoir. The fluid should be even with the bottom of the bolt hole. If not add some fluid. When you put the bolt back in, run the trim up and down a few times. That should purge any air out of the system. Always be on the lookout for any leaking hoses or fittings. Hope this helped and best wishes.
SOURCE: The trim/tilt on my 97 Johnson 150 outboard is not
Make sure there is not a spring loaded locking lift latch engauged. If there is you will see a little movement and then the motor will sound slower. If there is no movement and the motor runs the same speed with no change you are low on hydraulic tilt and trim fluid.
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