And you're not overcharging even if the volts swing past 15 volts...as long as they don't stay there. Even 16 volts for 16 seconds isn't going to cause a problem. The stator output tends to fluctuate, even at a given engine speed.
idle at 1000 is pretty good, could be a touch higher (1100 is the factory spec) but most of us get little to no charging at idle. 12.5+ means you're at least not discharging, and 14-15 is optimal charging.
I have the factory stator and get 13.7-14.0 most of the time until the bike warms up, then I get like 12.6 at idle with up to 14.2 at highway speeds (with some fluctuation)
Generally, though, 13+ volts is good charging, anything over 15 is interesting but not a bad thing unless it persists. I used to max at 14.5 with the factory R/R, but now get a max of about 14 most of the time with a mosfet R/R installed
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