Well maybe the weadeater casing is less heavy than the poulan casing some lots are different then others; I will try to take a picture on the scale!!! the other thing my muffler is very small I made it my self using tubular aluminum for window frames which is lighter than other tubular aluminum, that saved me around 2 to 3 oz, kept the hub small and light and the use of an APC prop over Master Airscrew also saves some weight; cut of the coil base permanently and kept it to bare necesities, my mount consists of two 1/2"x 3" strips of very ligth 1/8 aluminum from a chinese made landing gear bolted across the back plate of the engine (I'll try to take some Pic's)