I've been trying to figure out why jump starting a motorcylce from a car is such a destructive thing? Here's why I question it: 1- The battery voltage on a car battery (fully charged) is around 12.6 volts... the same as a motorcycle. 2- The charging system in a car keeps the voltage around 13.5 dc(+/- 1 volt)... the same as a motorcycle. Any ac voltage (usually 1 volt or more) indicates a bad diode in the charging system 3- The current draw when starting is very large, but will only draw what is required...Ohm's law 4- Electricity follows the path of least resistance, which would be your starter at the time of starting. With all that being said, I still feel like I'm missing something because I've read it sooo many times in other threads, blogs and heard it from many people. Can anyone clarify?