Jboyd, welcome to the site.
I don't consider myself an expert at all but I see a few things in your post that stick out to me.
One is I'm pretty sure 93 octane does not do anything to help a 2 stroke outboard engine. Second, you mentioned a new water pump in '04. If it hasn't bee run much since then it might still be ok, but I think the general rule of thumb is changing the impeller every 2 - 3 years to be safe (esp with salt use).
Hold tight....help is coming! Also best of luck on getting that horn to stop sounding.
Blue
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1994 Wellcraft V21
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