Piper J-3 Cub Balsa Wood Kit de corte de láser para avión RC 1800mm (70 ")

Hello, then surely I can put the rcgf 15cc, is that I have a p51 mustang 1600mm and weighed a lot and could not fly, I put the wing, so I am afraid that with this piper that apart I see that it is for electric motor , I'm afraid to put the 15cc, will be noble the plane with that engine, and will not be too heavy for that plane?