Motorcycle Questions? Ask a Mechanic.
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, proposed preliminary tries (if have not been done and even if just to eliminate it as a suspect) would be to check the charging voltage:
And please check the spark plug burn color.
For test purposes, try the Shadow with the regulator temporarily disconnected (but ensure battery is fully charged first).
...and interesting turn of events on the charging system.
Still, let's try and review the basics:
Please perform a spark test on the plugs. Click HERE.
With the plugs out,m check and post back their burn colors. Post a picture if able as shown HERE.