Tecumseh Engine Model HS40-55574L Ser 8266B Nice Running IllinoisTecumseh engine 4HP 4 cycle. It runs great smooth and strong. But it was over paint. External is not too clean. But runs really nice. The item “Tecumseh Engine Model HS40-55574L Ser 8266B Nice Running Illinois” is in sale since Saturday, May 19, 2018. This item.