My wife bought a $99 wonder of a lawnmower 5 years ago while I was away on a business trip. When I got back she had it mostly assembled and it had, you guessed it, a 3.5 hp Tecumseh on it. No throttle even, just on or off. Amazingly, it still starts on the first or second pull every time, and I have had no problems with it. I didn't even bother to change the oil in it for the first three years, because I didn't think it would last. Most recently I used it to mow around my rock and re-bar infested property I just bought. It is currently on loan to a friend. Maybe the lack of a variable throttle has made it last, but I have no complaints at all. Occasionally one gets lucky.