Re: bought X5 49cc Motor kits got 66/80cc kits??
I misread your post when I replied to it. I thought you wrote that you ordered the 80cc kit and the box said that it was a 49cc engine. My mistake. Anyways, it does look like you got the proper engine. The engines we commonly refer to as 80cc actually have a displacement somewhere around 66.5cc give or take. That's simply because we and the Chinese have a slightly different way of calculating displacement. Depends if you calculate it boreXstroke or if you also add the cylinder head volume to your figures as well, that's where you get the 80cc/66.5cc numbers from.
McGyver could fix that with bubble gum.