OK guys, you have help me out in the past and I got some more engines I need help with identifying.

Number 1, I have no idea...

Number 2-6 all seem to be K&B infant type engines, but they all have slight variations.
Not one of them is exactly like the other, some have larger cylinder heads some have
different intakes.
Like 2 and 5 originally looked the same, but 1 has a narrower venturi/ at the base.

HELP!

Thanks!!!!!!