As I come closer to restoring my 81 XJ550 Seca I still haven't figured out the weak charging problem. It idles at around 12volts and maybe peaks into the 13's when I rev it up to 3000rpms. I've brought it to two different shops and one says it's the RR and another says it's the stator. When I did tests on both of these items they both seem to check out fine. Nevertheless, I tried replacing both of these items with USED parts off of other bikes and I got the same exact results. Is it possible that a used or original 37 year old stator and/or RR can be weak so that when it's operating, it can't put out the voltage it used to? Or is it more black and white where they either work or they don't? Should I just go for broke and try replacing these items with brand new parts?