I'm not sure if this is exactly what you're looking for, but I've used the Yamaha EF1000iS 1,000 Watt 50cc for 3 years and it has performed flawlessly. I assume the 2,000 watt version will hold up as well.

I have used it for camping for 4-6 hours a day every day for a month, then not used it all for 10 or 11 months and then used it again for 4-6 hours a day for a month.

I do start it every 2 or 3 months just to check on it.

It almost always starts on first pull. One nice feature is that after it warms up, it powers down to a quiet mode and only ramps up as needed.