I finished up my Poulan 46 conversion and weighed it ready to mount at 4lb. 3.6oz. (67.6oz). That includes muffler, prop hub bolt and washer, carb, plug, switch, magneto, flywheel and engine. Basically ready to put on the mount and run, minus prop and spinner. I then weighed it mounted on the Hangar 9 mounts and it came out to 4lb. 9.7oz. (73.7oz.) That puts the Hangar 9 mounts at 6.1oz. including the mount bolts.