Gutless 252
It sounds about right to me! Honestly, the 252 is a good running little engine, but at best only puts out about 10 HP and two-stroke horses are a little harder to get any use out of (unless you've got lots and lots of them). The 252 won't do a lot of work for you unless you keep the rpms up, and then you only get what the 247cc can give.
The TT also came with a 295 JLO engine and that may be more what you're looking for without major changes to the machine. If you decide to go with a 4 stroke engine, I think you'll have to take careful measurements of the engine compartment- if I remember right, the TT is a little cramped in there.
Good Luck.
Stuck in the seventies- not in the swamp.
(6) Attex, a Hustler, a Super Swamp Fox, (2) Tricarts, (3) Tri-sports, a Sno-co trike, 3 Dunecycles, and a Starcraft! ...so far