Hey RysiuM, yeah it has lost a pound, the engine, carb, exhaust and prop hub (basic engine) weigh 57 oz. Ready to fly weight is 68 oz. That is with a MS Classic prop (heavy) Hangar-9 metal motor mounts and large metal spinner nut. With the mag it weighed over 5.5 lbs. The 25cc Homeys make as much power with much less weight, but the 4cy. is pretty cool! The sound is great! suprisingly not very loud with a straight pipe. I think it has the torque to probably turn a 20" prop, that would be cool for 25cc!