There is no customer service from hobbyking, this is well known. If you are not prepared tostrip the engine and fix it yourself you should have paid the extra and get one from BP hobbys.

Pay the extra and get full aftercare, buy cheap from hobbyking and take a risk, thats the choice. I bought from hobbyking and so far im happy, would buy another, but if there was a fault I would strip it and repair it myself, would not even consider sending it back to china.