Just wieghed the engine and the motor is only 22.3 ounces. Ignition is 3.5 ounces. Total= 25.8 ounces. I'm very pleased with the weight. The plane this one is going in had a Saito 130 twin than weighed in at a porky 46 ounces. So I've dropped a pound and a half on this one! And have'nt lost any power!!