I kept meaning to run my radio controlled car but never got around to it. Partly because the O-ring in the tank had vanished and I couldn't be arsed to fix it. Anyhoo, finally did it today and as the engine hadn't been used for about three years decided to give it the once over first. Long story short, I snapped the pull start string, fixed it, then pulled it and buggered it all up again. So now I need a new one and can't find one. Any advice? It's a Thunder Tiger part # PN0073.