I swapped my charging coil with one from an ebay pw50 coil. I wish I would have took pictures. You just order a flywheel puller and a piston stop, no big deal.
It does involve flipping the coil and a little wiring, once again I wish I would have taken some pictures. I do know that everyone says you have to solder, but I was able to use wire and carefully twist it under the coil mounting screws and it made a solid connection.