Overcharging is normally caused by a faulty regulator. Check voltage at the battery with the bike running between 2000-3600 RPM, depending on system specs, your readings should be 14.3 to 14.7 volts. If your voltage is higher than this you have a faulty voltage regulator. Under charging can also be caused by a faulty regulator or stator/rotor/wiring.
SOURCE: 2007 harley davidson flhx street
I don't work on the Twin Cam engines but if it'surging, I'd suspect a lean fuel air mixture is causing the problem whether it's carbureted or fuel injected.
Good Luck
Steve
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