Looking at an 89 maxum pictures look great. Knowing looks are not everything what are some things to look for. I will not buy until i put her in the water and let her run.
Uh simple answer is everything, soft floor bad stringers and transom, nothing particularly bad with the brand but the age is a concern, any boat, 25 years old, is possibly rotten to the core, check out this site, this is the worst case scenario https://www.youtube.com/results?search_query=frisco+jarretts+channel I would highly suggest that if you are not qualified to completely check this boat out that you either take someone who is or pay for a Marine Survey.