late70's early eighties by appearance.. and there is no way to fit a predator (or any four stroke really) on it
judging by the seat struts you cannot mount the sprocket anywhere near where it would need to be in order to work.
Also IF you alos had to buy a new rear axle since that one is unlikely keyed in the correct location.
ALso a 100 buck two stroke kart engine is a unicorn.. if you see one that's not dead, go for it!
make sure it CAN hold a clutch though..
since a direct drive kart is useless when not on a race track.
(clutches are expensive again...)
No, I'm afraid making this kart run for cheap is not going to happen really.
I mean sure you can destroy it
(by cutting the frame and seat struts and whatnot to fit the 212 or whatnot)
but then it'll be a real pain to drive it might even turn itself into a pretzel the first chance it gets.
Pick a different frame if you want to go 4stroke..
or raise your allowance for a proper engine
just my 2ct
'sid