I've had a pair of Honda 2000s for about 10 years. Until the last two years they were used infrequently. I mostly used them when I needed 120v far from an outlet around the property. Now, we use them a couple times of month while boondocking.
I always ran them dry before storage. Even after a couple years on the shelf, I could change the oil, add gas and start with one or two pulls. Besides reliable they are very quiet. When we boondock you can run the cord out point the exhaust away from the trailer and hardly hear them inside. We added an extended run gas tank to the setup.
