question about my aviator

i just got the saitek aviator the other day... i loaded up the default DC-3 and the B-25 in FS9... when i went to taxi i ran both throttle joysticks up but only the left engine would rev up, i checked the calibration and its set perfect through out, i then when into joystick assignments and tried assiging throttle joystick #2 to engine throttle 2, but this did not change anything, only engine 1 would rev up, so i went back into the assignments and twice to try to assign it to engine 3 and engine 4 (not at the same time) but it still didnt work.