over heating problem HELP

[footey]

hi all

i have a losi 8e { not a conversion } it had a losi brushless system { motor 2100kv } ive changed the esc to a monster mamba

the car has got a 45t spur and a 16t pinion im running a flight pwer 4s 5000mah and run it for the first time and after 3 mins the motor got so hot that it unsoldered 1 of the motor wires

PLEASE HELP as ive had nothing but bad luck with this car and its getting me down