It looks like ST redesigned the cylinder and muffler attaching method. Considering this, I would personally go with the ST over the TT. Mine has run flawless inverted and sideways. TT runs great, didn't have the muffler problems, but did not run flawless inverted or as much power. Like I said earlier, I may have broke it in wrong and that may account for it's less than standard performance. Both engines have been on my 4*40, inverted and sideways.

Monana is home for us. My great grandparents homesteaded at the base of the Big Belt mountains south of Cascade. Spent a lot of time there as a kid and ended up moving to Great Falls. Great place for the kids to just run around and not watch tv.

MikeB