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To me it looks like the powerhead has been replaced with a Mercury unit.----Compression test before you spend a dime on this motor.----New impeller before you launch the boat.-----Serial # on block is for an 89 model.-----Serial # is used to order parts.

No special oil required in those.------It is not an electric shift unit.-----Pressure test this gearcase to find leaks.-----Do a compression test before spending any money on this motor.----What electrical issues are you looking at ?

The 25 / 35 HP models ( 3 cylinder ) show a different stator for rope / recoil / armstrong start models.----The 9.9 / 15 HP 2 cylinder 4 strokes use the same 2 stators as the 3 cylinder 25 / 35 HP models I believe.

Post pictures of this Sea King.----If it is an OMC product , the consumable parts will be easy to find.

Any pictures with cowling off ?

Looks like a 1990 to me.--------Put a new impeller in it before launching the boat.----Make sure to change gear oil.---Use a good oil as lower units on these are not robust.

Do not rev that motor in neutral.----A new $5.00 diaphragm is what I would install in a simple fuel pump.

What kind of mess.-----????----Kids diaper full ??

Raise motor 1/2" or so and test run.----I would use a piece of hockey stick.

Brandon is the presenter who did not know how to remove tapered dowels on the block.-----Used a big hammer and was pounding them in the wrong direction !!!

If water got INSIDE the engine then bearings may be pitted from corrosion.

Armature / magneto plate has nothing to do with crankshaft endplay !!-----This motor is heavy compared to what ?----Likely lighter than many newer motors !!

One well meaning you tube presenter was trying to take tapered dowels out of a V-4.-----Hammered them in the wrong direction.----Then in another video he tried the same on a V-6.-----So yes some are good and others not so much.-----Careful if you are unsure if these guys really know their stuff !!

A 1955 model 25 HP is / was a well built motor.-----It is 65 years old.-----I would not leave the dock without a complete tear down and inspection !

They all rev up in neutral.-----Will do that running on just 1 cylinder.----That sort of testing means nothing !

On Johnson / Evinrude a 1/4" screw in aluminum is 60 / 80 inch lbs....---Does not matter if it is a 2 HP motor or a 300 HP motor.

Fuel pump diaphragm 331307 is easy to replace.----Factory part at less than $5.00

Hard to believe that someone would blindly replace all those very reliable ignition parts !!----Time to do some real trouble shooting I say.

It has had a new impeller put in I hope.-----Why would anyone install all those ignition parts ???----Was there no testing done ?

Steam turbines power a lot of generators.-----Put up to 1,000,000 horsepower into the generator.-----They ( turbines ) are less than 40% efficient.