I have a freind who recently flew his maiden flight on the GP Wagstaff Extra with a Taurus 3.2/52cc gasser. Excellent combination, awesome power... Weight is around 15-1/2lbs.. Planes flies great and looks even better...

The Moki 2.10 complete with radial engine mount and Pitts type exhaust weighs approximately 7 seven ounces more than a BME 50 complete with engine mount, stock exhaust and ignition. Add battery weight which is around three ounces minimum, dependent on cell type and size. You're still lighter and have a more powerful engine that runs for pennies comparatively...