I would venture a guess that the 4 KW rating is the output with a surge rating around 5 KW for short periods like when a motor starts. Nice is where I originally screwed up with fuel tank capacity. Four gallons should keep it running for several hours and much more under lighter loads.
Don't know if it holds true on this unit but Sears is good about online manuals so with an exact part/model number you can likely get a manual.
Additionally guessing from the image it looks to have a 240 VAC outlet which makes for cool if you want to set up a pony point where it can be directly connected to the mains supporting the house. Obviously not connecting directly into the mains! But a system to allow the unit to be dragged out and connected once the mains breakers have been turned off and back feed into the main circuit breaker panel through breakers.
As to age? More a matter of actual runtime. A ten or twelve year old unit with little run time in hours is as good as a new unit. You saw from your initial project that the guts don't change much. A unit with lower runtime that has seen good maintenance (regular lube, oil and filter with good quality oil) should perform every bit as well as a new unit.
It's nice to have the security of power during a power outage, especially in the cold of winters.
Ron
On the old B&S engines you can expect about 1500 - 2000 running hours if they are maintained properly and not ran at heavy overloads for long periods of time.
As far as what the power looks like that comes off of one of those older style generators its probably cleaner than what your utility line power is some days.
Generator age wise I have a early 1950's Fairbanks Morse 3 KW that still powers everything I need. I ran it for 12 hours a day for almost a month non stop when I started building my place out in the country about 10 years ago. It powered the saws and kept the lights on while I was working until the utility company got my service installed.
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