what is jump start voltage
The bike's regulator can dissipate a maximum of 700 for (very) short periods before it cooks itself. It's a tug of war, and the bike regulator ALWAYS loses. Moral of the story--jump-start your bike from a non-running cage. The quiescent voltage of a car (or bike) battery is in the 13.2-13.8 volt range. The only result of this is that the full output of the bike's magneto will go into the cage and moto batteries once the bike starts.