Riding lawn mowers

Yeah but that's only one engine. And yeah it was a bad one. Lots of good ones out there (with engines that have a better rep) get junked for stupid minor issues.
Like this Deere. LT166 I have,, sat long enough for tires to rot all the way thru sidewalls. Big gashes that no tube could ever seal. That's time it sat with no hours being put on the engine!!!
I had other tires here, to swap onto it. Reason it sat? Wouldn't draw fuel. Pickup tube in tank had pinholes in it. PO tried wiring in an electric pump and still couldn't get it to draw from the tank so he parked it. A $24 part from Deere. Has a Briggs vanguard twin cyl 16hp on it.
I've done other work to it as well/ once I saw why it wouldn't run and fixed that problem. Cleaning the rust and sludge out of the tank (thankfully it is plastic, I guess) was a much bigger task than replacement of that pickup tube. All minor things. Runs great, and it's FOR SALE hint hint.