Saito FA-125A AAC With Muffler - AGKey Features Less weight but more thrust 10 ounces lighter than the FA 120 Turns an APC 16x6 at 9,000 rpm 13mm Muffler threads Needed To Complete Propeller: 16x6 Overview Only Saito could put 1. 25 cubic inches of power into a 1. 00 size case. Not only is the FA 125 lighter and more powerful than the FA 120 it replaces, its unique size allows modelers to apply its awesome power to a wide variety of airplane sizes. It will work with anything from . 90