My johnson 50 when in the up position it slowy goes down and there no oil leaks ps how much tilt fluid should be in it tilt cheers michael

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

If it does not have Power tilt, the tilt lever is either not in the run position or the mechanism is bound up. Look for a hook shaped that engages your tilt rod (the rod that sets the tilt angle in the 4 or 5 holes in your transom bracket. BTW no rod, no reverse lock.

They always lock in reverse. Sometimes the adjustment is slightly off.
adjust shift lever.

Good Morning George,
First Thing To Do Is Use Pre Mixed Fuel Until This Problem Is Solved Or Engine Damage Could Be The Result.
Pre Mix Fuel -Oil Ratio Is 50:1
Have You Tried Priming The Oil With The Primer On The Oil Tank Supply Line?
Is The Oil Tank In The Boat Low On Oil?
Let Me Know If You Have Any Luck!
Cheers
Gordon

check powersteering hoses on passenger side. also may need to replace oil pressure sending unit

your car may be burning oil as you drive.add oil to fFULL line on dipstick,and check it every day to determine how much it's using.add 1 qt when level goes down to ADD

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.

it needs fluid added. had a 70 johnson do the same, I saw no leaks but it was low on fluid, put some in and have had noproblems yet.