I am concerned that I would have to cut the cowl with the G-90 as others have suggested that was the case in other threads. I really want to preserve as much of the cowl as possible. Does anyone know if the Tower Hobby engine will mount well without a cowl massacre?
As for the weights (according to Tower Hobbies):
The Tower Hobby .75 is:
Weight: 652g (23.0 oz) (with Muffler)
Weight: 535g (18.9 oz) (without Muffler)

and G-90

Weight w/o muffler: 589g (20.66oz)
Weight with muffler: 765g (27oz)