mega motors

What would be the best choice between these 2 motors? I've decided to go with CD instead of FD, but now which kit...:-||

I am looking for an 80cc bicycle engine kit online for around $200 - $250. I have seen many brands of engines with kit that all look identical. Some of the engines ive seen are: -SD Stinger -Grubee -Mega Motors -Flying Horse The engine needs to be EPA approved, and something that will...