Sure sounds like it's over charging. Do those bikes have a regulator as well as the rectifier? Or a capacitor that soaks up the excess charge?
Nice job on the vid.
2014.5 Kawasaki KLR650 NE-2006 Buell XB12SS-2002 Husky TE570-2001 Husaberg FE650E-1993 Kawasaki KX500-1984 Honda XL600R/XR650L Hybrid-1984 Yamaha TT600L-1980 Honda CB750F