I've got a 1996 SL780...
If the impeller isnt spinning, its going to have something to do with where it hooks to the crank or the impeller itself. I have never had mine apart, but they are fairly simple beasts by my understanding of them. Check the intake side, and if there is any debris there, clean it out. That alone could cause it not to move.
They are a PITA to work on, I would take it to a marina. To me its well worth the money spent to not have to deal with the close quarters and such.
Hope this helps-
Andrew
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Andrew
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