As noted above, I have a 2000 model of the Tohatsu 5 hp which I’ve used frequently over its life so far. It’s been to the bottom @ 15 ft since my post above. Nowadays, I have it serviced at a Tohatsu authorized when it starts to get “cranky.” This last time, I had the water impeller & zinc replaced. It’s on its 2nd carburetor.
E10 gasoline is not good for it. Service guys recommend stabilizer in the gas. I’ve used formula. It’s great, but service guys recommend against it, etc.
Basically, if the gas in the tank is older than two weeks, it goes into the car and I get fresh for the trip out. Change fuel filter regularly. Run the carburetor dry each time before it sits overnight. However, this just slows down the inevitable buildup of junk in the carburetor and jets. I’ve never liked this engine
—my first 4-stroke.