Re: 1985 bayliner (need help)
Welcome to iboats . . . just to add to the comments so far . . .
Bayliners are like the "Model T" of boats . . . they have allowed many people to own boats and get out on the water. They are lower end boats (so is that "good"?). A 1985 model is pushing 30 years old, so it is a crap-shoot as to the kinds of deficiencies that have developed over the years.
$900 is fine, $800 or less is even better. (trailer included (right?). Make sure the seller has and provides proper Title for both boat, trailer. Bill of Sale, does not cut it these days.
Sellers always (always) down-play issues with engines, etc. So, don't think that you will slap a $15 part in the engine and it will come back to life . . . if it were that easy, the seller would have done it (right?).
However, it may be workable, if you are approaching it as needing some work and $$$$. If you are thinking it is 'ready to use', then that is probably not the case.
So, if you want a project, take a look at it, find some other "serious" issues, offer the seller $500 to take it 'as is'.
If the boat is in good condition (i.e. a diamond in the rough), except for the engine, then $900/w trailer is reasonable. (NADA "Average Retail" is $1400 for that boat)