I've already done the diff oil but I was actually thinking about the Savox servos it came down to 2 one was 12.5 Kg/cm with 0.08secs and the other 20Kg with 1.13secs both the same peice around £55 each is 12.5 Kg enough or should I go with the powerfull 20 Kg ones. Have you got any videos of your hyper with a proper racing engine in it. I was thinking if I am not happy with the Axial I will sell the 2 engines I have and try and get a Ninja MR28 but I can't find anywhere that sells them. Apart from America. Oh last time out I wrecked my spektrum 2.4G reciever as a little drip of water got in it is there any mods to make the radio box water tight or are there any after market ones out there.