The 18x6W is a little too much for the Saito 120, its more for something like a YS140 or the OS160. Try to use a 16x6 or 17x6. I just got mine ready, everything xcept for the cowling. I am using a YS110 and the plane will be nose heavy once the cowling comes on. I will have to shift my RX batt and other stull more to the back. Hope she flies well!