I just bought a used Honda Recon 2002 model. I decided to change the oil and realized I was tricked by the previous owner. The drain plug has what appeared to be welded pieces or some type of liquid nail around it. I had to pull it away from the drain nut to unscrew the nut. The nut came out but the threads of the screw began to break into pieces. I was able to push the entire threads inside the crankcase. I'm assuming there isn't way method for repairing this except replacing the entire crankcase. I don't have experience at this and don't know what else will have to be changed. The previous owner had to patch this up enough to sale it. I was screwed. Anybody have any suggestions...