I just used my 21+ year old Honda Harmony (w/blade clutch) today. It takes about 2 hours to mow my lawn. Best mower I’ve ever owned. Sometimes I look at the new models and dread the day I might have to buy a replacement. If it ever conks out, I’ll look into having the motor rebuilt or purchase a new motor. They sure don’t make ‘em like they used to. I’ve replaced a few sparks plugs, one pair of drive wheels and the speed-shift cable. That’s it.
Draining your tank and leaving the carburetor dry all winter—not a good idea. I’m a big fan of Seafoam. Got some bad gas in my Harley one time and it saved me the trouble of dealing with that issue.