Does anyone know how many oz. the stock fuel tank for this kit holds? I am flying it and getting only 10 minutes of flight time with a YS 140. I know the 140 drinks fuel like coolaid but...still, 10 minutes until dead stick?.....I have to set the timer at 9 minutes, that is a little too short of a flight time for me. I was thinking of upgrading the tank to 20OZ. thinking that the existing was a 16 OZ, but I am not sure since there is no info in the manual or anywhere on what size the stock tank is!?