I just bought a pair of 110s (80 and 81) for $50 here in GA. I think I got a great deal...one is running (lots of smoke) the other is missing a few pieces.
Anyways...a few differences that I've found so far between the two....
'80 has a round headlight, '81 has a square headlight
'80 has points, '81 has CDI
'80 has a shallow pull cord assembly, '81 has a deeper dish on the pull cord assembly
BTW, on your attachment, what does sweet and super sweet stand for?
'80 & '81 Honda 110 ATCs in the process of rebuilding