My Enya 60X model #7101 weighs 18.5 oz with glow plug, muff screews, carb and prop nut & washer (no muff). Heavy but a nice 2 piece case, big bolts and built strong. I had one in a Prather Panther with Tuned Pipe for 300 flights, it ran flawless. I still have my new spare 60X never needed it, nice engines, small carb but it ran respectable as far as power goes. I'm going to try a large OS carb when it finds a new home in a classic pattern plane.