Originally Posted by chad-ANTIGRAVITYLITHIUMBATTERIES
Essentially the concern with charging here is that a lot of bikes from the mid 80's and older were using old style mechanical voltage regulators.
Thanks for the comments, Chad. Just so you know, I think you'll find that the regulators on these bikes use SCR diodes to do the shunting, i.e. they're not mechanical.
Not that makes the voltage regulation ever so reliable ! :-)