There is that cup shaped washer that surrounds the cam sprocket bolt. What's it's purpose? Do you have to have it? Is it attached on an eccentric? Any help? 71Z. Thank you very much,TimsZ

The eccentric drives a mechanical fuel pump. Moves the lever back and forth. Only necessary if you have a mechanical pump, although you might need a washer to make up the thickness for the bolt (not sure on that).

Thank you. I wasn't thinking. My mind gets boggled with all this info. I have an electric fuel pump. TimsZ