On my giles the motor mount was allready installed at 7:30 if you were looking at it from the front., the top of the motor is down and to the left. This would line up the exhaust to exit from the bottom cutout. If you shimmed the top and left (sitting in the plane) sides of the mount you would get the appropriate thrust. I dont know about the YS 53 but the 63 is great on the Sukhoi. I did increase the tank size 4 oz though. Dead sticks can get ugly if you are not on your game.