Voltage from your stator is a/c..yours is probably fine.. measuring from stator to frame will not give you a true reading, but it sounds as if you have plenty..from there the voltage goes to the rectifier this does what it says on the packet and rectifies the voltage from a/c to d/c..now at this point if that was all there was, and the rectifier was working correctly as you increase the revs you would continue to increase the d/c voltage until it got so high that things started to blow..so you have a voltage regulator..which is a solid state package of components that stop the voltage from exceeding a preset voltage...in this case up to 14.8vdc depending on the set up...
so assuming you measured correctly and the stator is ok, you should have a faulty reg/rec..
I don't have the same bike as you so hang on before you rush out to the parts store and see what someone with your bike says about it.. It is also possible that a loose wire anywhere in the setup I described could be losing voltage when you increase speed due to vibration and this could give a similar result..
A volt or ohm reading from the negative terminal of the battery to the frame (when you lose the voltage) would be a good idea..both volts and ohms should read zero as the two points should be tied together.
Beauty is only skin deep but ugly goes right to the bone.
Last edited by John Hopkins; 02-18-2012 at 05:41 PM.