Instructions
Check the fuel if a strange noise is coming from the servo motor. Make sure all servo motor wires are properly attached. Check the servo motor sounds and hear if it is normal by turning on the engine. If the sounds are unusual, there might be internal problems with the motor.
Ensure that the battery is charged fully if the transmitter is not properly sending signals to the helicopter. Tighten the antenna to make sure that its is properly connected and will not fall off.
Check all helicopter parts to make sure all parts are tightly attached and balanced if the helicopter vibrates. Apply grease to all the bearings if needed.