Re: cbr f3 regulator problems.....
I found unplugging the regulator at the stator was the best way. It should idle around 50 volts each phase. Each phase should measure about the same to the case. Be careful about reving the bike with this test. I've gotten nearly 500 volts.
You can also take the stator cover off and check it visually. If you see a few windings that are black, sooty, and smell terrible, go ahead and order a new one.
The regulator is a shunt type regulator, which works by using SCR's to clamp the waveform when the desired charging voltage is reached. Very simple, cheap, and effective.