I'm having a problem with the voltage dropping after a few minutes of riding.It begins about 13.5 volts when inially driving but then drops to 12-12.5 volts.If I pull in the clutch lever and hit the kill switch killing the engine but then turn back on the kill switch and release the clutch the voltage jumps back up to 13.5 volts.Would this be a weak voltage regulator or a bad stator as i've heard the vfr's have problems with?My model is a 1999vfr800 with just 23000kms.Any suggestions to correct this problem?