If you want lots of hp in a light engine, Harbor Freight Tool has the 6-1/2 hp Jiang Dong on sale fore $129. That is what I paid for my 5-1/2 from Truckload Tool Sales. I have been well satisfied with the engine. It is a sloping OHV engine with a low oil shutdown, ignition switch, fuel shut off, choke, and a governor that makes a pretty cool cruise control. With that much power you will not need to apply more for hills or slack off on downhills. Your speed will remain constant with traffic. Item 96549 Price good through Jan 13. Check it out on the internet.