Hard to say given so few of the Cubs had hour meters that ran them. Using the QL tractors as a guide, and given that I've seen some old machines with original bores in them, I'm going to say around 1200- 1500 hrs. Some last longer, some don't make it that far, but in a tractor, I'd say that's close. Now, a K series in say, a gen set, should last at least twice as long.
After years of engine rebuilding, I'm here to say that how it gets operated makes as much or more of a difference even than regular maintenance.
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