Selling my FC thinking of a 1st gen. Problems to look for?
 

Pretty much what the title says. Someone wants to buy my FC some kind of fierce and i've still got the unscratchable rotary itch. I've thought about buying a 84 or 85 first gen. Fuel injected 13b. It's a lighter model than the FC that's what attracts me since i plan to race it and have some fun. What are some issues i can look for on this gen of rx?