Question: What is a fair price for a 1993 Yamaha 40HP electric Start motor?

This motor was bought brand new in 93, was used on weekends in the summer months (not sure of the hours on it) then left sitting on the boat in 1995 uncovered till now. It does turn over(but does not start) need to get rid of the old gas in the line and hope fully that will do it. The body /Cowling has some scratches on it and the paint shows oxidation but underneath the covers the motor looks to be in excellent shape. I am sure it needs a tune up. The prop does have sign of use and would not hurt to replace it.

Reason I am asking this was, I received this boat with this motor. It came on a 16' fiberglass semi- flat bottom boat( tender ). I was told that the motor was not powerful enough to plane but good for puttering around the sound. I was thinking of selling the motor and getting a 75 or 90 HP instead or just get rid of the whole thing, boat, motor and trailer and get something else.