Yes, their is no 80cc...it's closer to 67.5cc
I ran into a gentleman here in Tucson while riding my motorized bicycle. He was from NH and said he had a motorized bike that he got registered in NH.
It was like a year ago so my memory is not all that great.
1)He told them that it was a 48cc
2)He told them that it was home built
3)Used bike serial # make, model, ect.
4)Had to have Head light & tail & break light
Thats about all I can remember
Here is a link for moped law.....
New Hampshire Moped Laws