Not really,
Here again, how well was it taken care of and (more important) what kind of oil was it ran on for most of its life? My father has about 1500 hours on his old 86 150 Yamaha and runs very well here again, he has ran it on synthetic 2 cycle and gear case oil which has helped a lot...
You should be able to take it to a Yamaha dealer and get a CPU data dump and that could tell you a lot about how the engine has been ran. I know the newer CPUs store how many hours the engine has been ran at each RPM band range which would tell you a lot about what kind of life it has had. I would also want to see any and all service repair orders to help give you a more complete engine history. While there, I would have them check the compresson on all cylinders and ask them what they think of the engine's condation. Might be the best money you ever spent
Hope this helps...
Dave