at least 15 to 20 years. you definitely want to use fuel stabilizer additives in a generator and any jerry cans or similar storage, and I would run it annually and check the oil. I would not run a whole tank- just enough to run it 15 to 20 min.Sounds like a good plan. What do you consider is the shelf life of a small gas motor? I.e. how long the rubbers and plastics will stay good? Maybe sometime soon sell it on craigslist/marketplace and buy it's replacement for the next X years. Just like keeping fresh gas.
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