mowermech wrote:
Those who recommend "chemical overhauls", do you really want that gunk that is in that carburetor dissolved and run through your engine(s)?
Based on personal experience as an Outdoor Power Equipment mechanic, having worked on units that such chemicals were used in, I say "Not me!"
Every year, we got units in the shop that the owners had used just about any chemical you want to name (Seafoam, home-brewed Seafoam, Heet, Iso-Heet, Gumout, acetone, Sta-Bil, etc.). In the end, most of them had to bring it to the shop and have the carb rebuilt or replaced (some of the harsher stuff actually damaged parts of the carb!)
OP, go ahead and buy the generators, then take them to a reputable shop and get the carbs cleaned properly, the oil changed, new filters and spark plugs, and the generator output tested and set for voltage and hertz. Use your favorite fuel stabilizer in every can of gas right from the start, and you should have no further trouble.
Good luck.
The ones that came to the shop were probably the ones that were coming to the shop anyway. While working for my friend at his John Deere dealer we never recommended Stabil. It only puts a scum layer on the fuel for oxidation. It may have worked back in the day but not with todays fuel. We put a note in large print in a sealed plastic bag on every unit we repaired. DO NOT USE FUEL OVER 45 DAYS OLD. DO NOT store fuel in equipment, drain fuel. Seafoam can be left in the carb FULL strength all year and it wont hurt it.