I know the Saito singles like nitro. I would assume that the twins do also. You can get by rather well by using anything from 15% to 30%. It depends on how much money your willing to spend. There's a guy at the field that has a larger Saito twin and he runs between 15% 20% in it depending on what he found at the store and what other engines he brought along.

I had always assumed that the Saito 90T engine was originally intended for use on a Hanger 9 80" J-3 Cub type plane. It would be ideal for that plane will fly with a 52 single cylinder 4 cycle engine. I have a couple of the Magnum 61 four strokes and a Saito 56 that fall in this power catagory and they turn a 12-6 at about 10,000 on 15%.

Enjoy,

Jim