RE: KMP / YT FW-190 Build Thread
Hobbyking doesnt list the dimensions of the asp400, but its 5x .40 4 strokes around the central hub and the saito r170 is 3x .56's. The 56's are bigger cylinders, but the central hub area of the asp 400 is larger due to the crank needing to accomodate 2 more cylinders.
Since the saito r200 is the same displacement as the 170, it will also fit in the esm 190.
If you've already got the asp 400, then you might want to instead put it in the new TF 50cc size FW-190. Ppl are flying 96" gee bees with that asp 400 so it will definitely fly an 86" or so warbird with ease.