A well cared for a low hour 1998 Honda 90 hp should be a good motor. You may have to have the carbs rebuilt. Each time, I use the boat, (try to avoid ethanol laced gas), I drain the carbs, unless I will be using the boat again within a month. If within a month, I run the engine every 2 weeks. This prevents the carbs from being gummed up. The only other negative is that those engines only have a 17 amp alternator (2007 on had 40 amp alternators). I have a 2006, 90 Honda, which would be virtually the same as a 1998--and it works fine--top speed in a light boat is close to 30 mph--should be the same for a 1986.