I bought a brand new Shuttle ZX some 10 years ago and it came fitted with a Super Tigre 34. I tried to learn hovering on it but everytime I throttled up and it came to the point where the heli looks like it is just about to lift off, the engine would stall. No matter how I adjusted the 2 needles, I couldn't get it to lift off without flaming out. Subsequently, I gave up trying and the chopper has been sitting as a display until now. I have decided to give myself a second shot at learning to fly nitro after these 10 years because I had some success with basic hovering on a tiny electric Dragonfly. Please tell me what could have been the problem - poorly balanced blades; wrong pitch of main blades; bad mixture; anything... Just HELP! Also, should I assume that the engine is scrap metal if it had been left in the heli all these years without being used?