im suposed to be getting my go cart fixed

i dont know how to put a carbrater in to my go cart.my dads frind is supposed to come and fix my go cart a long time ago.but apprently he had diffrent plans cause he never came to my house to fix it.its been sitting in my barn forever.my dad can do it only it will take him to long.i have another go cart thats sitting in there by it and the chain came off and it has flat tires.i just hope he comes to fix it soon.so i can ride it at the track.