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see post #9-----Your location ?

There are 5 bleed inserts.-----In the past I installed 8-32 set screws with 0.040" hole.----Never to fall out again.

Idle this machine at 1200 RPM.

???----Really ?----Not aware that this is a JET boat with no gearshift !

I believe that motor needs to idle at about 1200 RPM for proper cooling.

Have battery load tested.----Take starter apart for inspection .----No money spent on this.---Are you pushing key in and hold key in while cranking it over ?----Do ohm check on starter armature.

Some simple inspection and testing will sort out this motor.----Jumping up and down and guessing does not ---Sorry to be blunt here/

Your pictures clearly show the electric choke installed on the carburetor.

Plugs look different.----Checked fuel pump diaphragm?

Remove bypass covers ( 4 screws each ) look at pistons / rings.

You may want to test rectifier / voltage regulator.

Bleed inserts checked if equipped with 5 of them?

Simple to take starter apart for inspection / new brushes.----Do an ohm check on armature.---Should read infinity.

And 1992 was the last year for that starter.

It is MORE than a little low.----Pull bypass covers and look at pistons / rings.----Unless you have a faulty gauge?

Your motor is NOT a 1998 model.-----Model # is ?----Or perhaps a typo and you meant 89??

????----It is a part made of CARBON !!---Very common item / material used in mechanical seals.----Make sure you assemble with this simple / durable seal.---Good luck with your motor.

The black part is CARBON.-----The crankcase does NOT have its own seal either.----But good luck with your motor !

The broken part is carbon , not metal.

The black part is the seal under the powerhead.----The cup washer is part of the seal assembly.