The beginning, dys 4500 that calls for a 24hp intek engine. It has a 17.5 engine on it. Mind you this is a craigslist $150 deal. ( i bought it hoping the deck would match another mower I have). on flat ground it mows and pushes along just fine. Now the real issue uphill is terrible. not enough power to shove the mower and a 200 pound human up. the other uphill issue is stalling like a lack of fuel. the lower the tank the worse it is. Please let me know if there is a good inexpensive place to obtain an engine 24hp intek. thanks all.