I love the LT40, although mine is in heaven now. I started out with the LA40, then the LA46, and wound up flying it with the Tower Hobbies 46 ABC. This engine is probably one of the most powerful 46's on the market, and if I build another LT40 or get an ARF, I think I'll use it. As far as the Tower 46 is concerned, and I hope this isn't thread drift, don't be scared off by some of the negative things you may have heard. I broke mine in "by the book", and it is a superb engine. It has a great idle without my having to ever touch anything, and I've never had a dead stick with it.
Glen