So with the recent restore on my TX650 I did the reg/rec mod as outlined by 5Twins in the "DIY Reg/Rec. 5twins and Jim thread". I've done this mod to several bikes now. Was running the original rotor and it was charging good hitting 14.8v on higher revs. I knew it was a matter of time before that 50 year old rotor blew, so today I installed a fresh rewind that I bought from Jim back when I first got the bike running 3 years ago (when I did the reg/rec mod). Voltage is now hitting 15.25 and seems to stay at that voltage or slightly lower above 3,000 RPMs. I'm also running this little lithium battery with on-board battery management system that protects against over and under charging. Really impressed with this $69 little battery and its cranking ability. Is it incompatibility with the VR regulator and the lithium battery, or is the VR reg not doing its proper job, or is 15.25v okay, given the "smart" battery involved?