I actually did not have to add any weight anywhere in the plane. with that said I did install 1/4 scale servo's for the elevator and rudder in the front of the plane with a pull pull system on the rudder. Now with saito installed I had problems. could never get that motor to run right. All the fault of me I beleive. the motor was brand new and I don't think I broke it in fully and I didn't really know how to make adjustments to the pushrods and valves so I didn't mess with it. I flew it a couple of times and wasn't impressed at all and I had removed the 1.60 from another plane so I just switch them out and havn't had a problem since.