Hear is what I did with one of these, this started life at that same bike.
The Auranthetic Chargers must have sold somewhat well because they pop up every now and then. I can name many rarer brands. I have seen 3 of these in person; Mine, another gass converted one with a big block and a fully complete example without a battery, needing restoration. (not running) and a few pictures of gass conversions.
![DSCN0327.JPG](/forum/data/attachments/239/239819-54753aa0ff8143fd3bae1526f2307fef.jpg)