Thanks! The price is certainly a consideration but right now I am looking at size - compactness, and weight. I have even considered a gas powered radio control motor used to fly airplanes. They have some that are 50cc+ and a few that are 4 stroke, though oil still has to be added to the fuel - no crankcase. Weedwhacker engines tend to be compact also and only about 7 pounds...so..please continue with your suggestions. I am really trying to think outside of the box here
FYI I can get a "huang seun" here for about US $80 There is also a factory in the south of China that makes the little Hondas...they also will make the same engine and sell it under a Chinese name. I trying my best to find that brand.