A couple of years ago I owned a very hopped-up 2003 Aprilia RS50 that blew-up for the final time (the con rod gave up). I gave it to my son-in-law who sold it to a fellow by the name of Henry who planned to electrify it. He now has it running and it is powered by a 2013 Zero motor (apparently he knows someone at Zero). He plans to take it to the REFUEL races at Laguna Seca in July. Here is a link to a video of the bike on a dyno. If you go to the REFUEL event, check it out. I sure hope his con rod doesn't break like mine did.
Attached is a photo of the bike when I owned it.