Well, BME do not even have the 50 on their website only to 44. From chiefaircraft.com the engine weighs 3.3 lbs and the muffler is 3.5 ounces. They do not say if that is with the ignition or not though and Im not about to pull my engine to find out.
I will be getting a 22 x 10 Mejzlik tomorrow so I will post my tach readings this weekend.