Re: new to the club
A word regarding vendors and engine size. I would just go with the 66(80)CC. They're more common, look virtually the same and will give you more power. Cost about the same, too. One good vendor I'd recommend is Priate cycles. The PK-80 engine is good running and strong. Justin stands behind what he sells and is a good guy. You can buy cheaper on ebay, but if something is wrong will the seller stand behind it and make things right? I'd pay a little more and have some piece of mind. Welcome to the forum. You can always upgrade later to a shift kit if you decide you need some help with gears.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...