Ok I was given a 1996 honda 300 fourtrax 2×4. I could jump it off and it runs. It smokes bad. I changed the oil and noticed they had the filter in backwards. After looking at the carborator I decided on buying a new one. The gas tank needs to be replaced because of how much rust that is inside. I’ve also noticed some gas leaking out the bottom on the side. The smoking even after a few oil changes is still the same. Also the kickstarter on the side doesn’t catch so I know that is an issue also. I hear a little knocking in the bottom end. So for the experienced folks what would you do? Look for another motor? Redue the top end? Find a new bottom end? I saw an 88′ bottom end would that match up to a 96? I know a million questions. I will stop rambling and hear what people have to say. Thanks in advance.