2 Cylinder Engine (Without Gearbox)

A 2 cylinder engine that can be attached to my 2 speed transmission. I have not printed this, however I have printed an engine model based on a similar design that functions properly. If you wish to print this i have designed it to be assembled with 12 and 8 mm long m2 screws and 3 bearings with an inside diameter of 8 mm outside diameter of 22 mm and a width of 7 mm (standard skateboard bearing size).