I gave my buddy an old atc 110 i had bought for cheap, letting him keep it if he fixes it. We tore into the ol girl and found a cracked in half frame that someone tried fixing, and a worn out engine with quite a few problems. We found a frame for 50 bucks in mint condition so thats covered, but we have been trying to figure out an engine idea. Itd cost over 300 bucks to fix this engine, but a brand new lifan 125 is about 300 and its new! So what all does this entail to install? How hard is it to bolt it in? What is this Dr. ATV i keep seeing? How bad is it to attach it to the rest of the wiring? Do people have good luck eith these engines? I just have no idea and havent found much. Any feedback is appreciated