I have tried searching for quite some time and am probably just looking in all the wrong places as it seems to be a common problem. I think i may be lucky and just have a bad regulator (i doubt this, hence wanting to do full testing) as i get good voltage, but the voltage goes from about charging voltage at idle up to about 18 volts higher in the rev range(noting this I'm surprised the battery hasn't exploded or something yet) anyways the bike is a 1980 CB650. the R R will be replaced with an automotive equivalent, but id like to check the rotor and such, so if anyone can either post or link to it id greatly appreciate it.