im jumped my quad off with the truck when i first git it (quad) and no ill effects to this day, the truck was running but i also pulled the cabels off as soon as the quad started. if youre in a pinch theres nothing wrong with it. 12 volts is 12 volts no matter how you slice it.
All we use in our shop is a car battery(remote location jump starter), never have the car running, and an ATV has alot less electrical componets than a modern sport bike. It could cause all kinds of ECU problems.
Opps.. i just got done jump starting my bike with my car running... i had the car on for about 45 secs before i took the cables off of the bike though, will that still create a problem? when i took the cables off the bike was still running however it sounded like it was gonna die.. how long do i have to keep the bike on until i can turn it off or how do i know that the battery is fully charged? i got the bike back from the impound where it was stored indoors. the battery just needs charging and i was wondering how to do that? thanks