Technically, if they listed it as RTF, then it should come with an installed engine. And, frankly, if it doesn't, and it has wing damage, and you paid 225 dollars for it, then you got screwed. You can get a brand new RTF trainer with .46 engine and radio, truly ready to fly within 30 minutes of opening up the box for 289 bucks. If you already have JR stuff, then you could either put it in, or keep what's in it. Just make sure your radio and the included receiver are compatible (positive shift or negative shift).