Now your making me jealous, a VERY unique and rare tool. I have something very similar but it's a little more modern looking. Your Amp Champ generator would be very rare over here as well since ours put out 110v ac and 12v dc, plus the outlets are on the sides. Yours are on the back and output 220v I believe.
Let me know if you need parts for the recoil starter but most of the time, it's the spring end broke off. DON'T remove that rivet #12 holding the little cup bearing #10. There is no need to separate that cup from the housing to get the spool off. Just be very careful not to bend the spool #3. Pull from the center and don't pry on the outer edges. If the spring is broken, just heat the end with torch and you can bend it to the shape in the drawing #7 without it breaking. (They made a mistake in these drawings and show the spring coiled in the wrong direction)