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I'd say run it hard until it quits. Right away pull the plugs and check if they are bone dry or are wet. If they are wet it probably isn't the gas or carburetor since the gas is new. More likely an electrical issue. Which is what it seems to me now. Something like the seat or operating in reverse sensors. The fact it will sit at idle for 45 minutes with no problem but when you engage the blades and get things vibrating makes me think that.
Take my yokel advice with a grain of salt. In any case you're a good person for helping out your neighbor.
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