I knew someone was going to ask that question ?
Who knows ? Put it like this, I have several 2 cycle engines, all name brand except the Harbor Freight auger engine, I started all of them about 2 weeks ago for the first time since last grass cutting season. They have all been sitting over the winter with fuel in them and "NO" stabilizer. My Stihl chainsaw has been sitting for over a year. Everything started fine and runs great except the Honda, so maybe I lucked up.
My Honda GX35 which is on my bike, sat through the winter, it starts fine and will sit and idle all day long, but give it full throttle and it shuts down just as if I pressed the kill switch. I have not worked on it as of yet. I am not looking forward to it. I have never had luck with rebuilding carburetors. I’ve always ended up having to replace the whole thing. Maybe I just don’t have a knack for carbs !
However, I recently bougt gasoline with no ETHYNOL for all of my small engines, both two and four strokes. I think it was $00.40more per gallon, but to me that’s a cheap insurance policy.
Also, seems like all the people I've talked to that sell and work on samall engines tell me about 3 months is the golden rule of thumb as far as letting an engine sit unused. I've been luck so far, but I'm going to run only fuel with no ethynol and will also use fuel stabilizer in the future.