Re: Guidance Please
I think all of us have gone through this dilemma at some time. Your right, top speed is about the same. 66cc is supposed to have more torque which some would say will get you up to speed perhaps a bit quicker. A 66cc would also be more likely to pull a bigger guy up a hill. Some say that 66cc is more prone to vibration.
I think the deciding factor would be the legislation in your state. Many states limit to under 50cc. That being said, once you unbox the motor and remove any stickers, it is tough to visually tell a difference.
My vote is for 66cc unless you live in an urban area of a very strict state who requires documentation for 50cc or under.