Hi guys got a sky King helicopter when I turn it on and turn the transmitter on everything is fine lights work but then when I push the throttle to start flying the propellers goes around once then cut out but the lights still work any one have any idea what this could be?

Is anything blocking the main rotors from turning? Look closely for hair wrapped around the main shaft or damage to the main gears.

Is your battery fully charged?

That is a coaxial helicopter right? Also check the main shaft is not bent slightly and causing friction to the concentric shafts.