The parts diagram shows a screen in the tank, so I go to my Honda dealer and buy one. It will not even begin to fit through the opening. Double checked part number and it is the right number. Has anyone else replaced the screen inside the 1980 CX500 fuel tank?
If past memory serves me correctly, that screen is a tight fit into the petcock hole. You almost have to force/squeeze it in. Now if it is obviously way too big, you have other problems. Maybe a wrong part in the correct envelope. Are you sure the original has been taken out? They are usually a whitish color plastic. I have had good result using a Easy Out gently turned into the filter to extract it. Just don't pound it in, hold it in your fingers and then pull it out.
I'll give it another look to see if there is an old one stuck up in the tank. It just didn't seem the replacement would even fit through the opening though. Once I get the tank off I'll post an update.