The 580 Rotax engines in these machines is very durable. That being said Be very carefully of anything that hasn't been winterized and even more careful of one where the sellers say "it just needs the tank cleaned."
You need to do a compression test on any old watercraft you buy, so the motor needs to at least be able to turn over. If you have a strong compression engine you can go from there, if not walk away unless you can get it for next to nothing.
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