RE: Best engine for the 4*60
I agree with WCB here. A good .91 4 stroke is perfect for the 4*. I had one with a Thunder Tiger .91FS (sold it this weekend) and it was great. Another guy at the field has one with an OS 91FS and his flies just as good. I'm sure a Saito ot Magnum .91 would be just as fun.