How many hours is too many on a motor

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I've ratehr have one with an average amount( approx 50-100 per season) than one with extremmly low hours(unless it was properlly stored). I've seen boats that were 5 years old an have 100 hours on them that were junk, and I've seen motors that had 4000 hours on them that ran like a dream. Hours isn't as important of an issue than maintance and condition.