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Could be the oil that is mixed with the gasoline.------Some fuel mixture goes right through the motor.----It does not get compressed .----It is not burned.----It is wasted and ends up going out with exhaust.

Cast iron ( not steel ) sleeves I believe.

A 1994 would have a big red plug when it left the factory.

Who decided that the 17" pitch prop was the one to fit this pontoon boat ?

Visit a marine store.-----Ask about cleaners for outdrives.------As water evaporates from the exhaust housing the minerals stay behind and build up.-----

Stop using the boat.-----Put a " NO SMOKING " sign on it.

Just minerals from the water.

Nope---I believe you refer to a " preload pin " on the shaft.----Has to do with thrust loads on pinion bearing.

Perhaps you need to talk to a prop expert.-----If the motor is in " perfect condition " you have the wrong prop to fit the boat.

What boat is it on?----What pitch is the prop?-----And post the actual vales of a compression test.

Try 21-15/16"

Look around.-----Find a small shop that still rebuilds these things with a one year warranty.

Often times older folks buy new stuff so they have warranty instead of worries.

Very few people bought V-6 motors just to " baby " them.----Find an older one , rebuild it and use it for 20 years.

What is the thermal efficiency of a coal fired / steam turbine / gen set ?

Does it work with the switch on the lower cowling?

Worse yet is putting dams in rivers all over the world.---Just to generate power.------A 100 years from now do your grand kids need cheap electricity or fish to eat ?

In many places electricity used to charge EV batteries is generated by burning dirty coal.----A lose , lose for the environment.

There are / were some very serious internal corrosion issues with Yamaha in the 2003 / 2005 years.

If the shift dog broke it would explain why you found these pieces loose in there.