I bought a 73 cb100 a few weeks ago. It didn\´t run so I went to work on it. There are a few things you might check if you havn\´t already. 1)Make sure that fuel is able to reach the cylinder. You mentioned that you stopped the leak, but did you pull the bottom float tank off, clean the brass intake tubes and needles?
2)If that is taken care of, Make sure that all of the grounds on the bike are clean. You can look on google to find a wiring diagram. I polished the bolt points where the bracket for the coil bolts on. Also, use a volt meter to check to see if your capaciter is still good. Basically if you check the grounds and connections leading to the spark plug you should get it to run!
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