hi guys....

some say its ok to jump start with the car battery.. .some say no....
pls help.. my nightster's battery is flat! ...

thanks in adv.

p/s: i mean jump start.. not a jumping sportster lol...

 

Not a problem, you probably dont even need the car to be running.

 

Much safer to buy or borrow a battery charger.

Leave it hooked up and plugged in when cranking. There's even a start setting on the newer ones.

 

If you must. But I would run the car idling at most.

 

Sure you can. They both run of a 12 volt system it's just the car battery has more amps.
The car doesnt even need to be running.
I had to jump start my Honda a few times this spring and didn't have any issues at all.
Go for it. 12 volts is 12 volts

 

If it was my only choice because I was in middle of nowhere - sure, but DO NOT START THE CAR'S MOTOR because the extra power from the charging system will possibly destroy the motorcycle's charging system and could cause a fire. The car battery should have enough power to start the motorcycle without the car's motor running.

 

+1 - Unlike most modern vehicles, Harley uses a "shunt" type voltage regulator which dissipates excess current to ground. DO NOT jump the bike from a running vehicle.

No, it's not a case of 12 volts is 12 volts and this isn't a Honda, you can easily blow your 22 amp regulator by hitting it with 100+ amps from the cage.

 

Don't you know how to push start a bike?

 

DO NOT START THE CARS ENGINE OR YOU WILL MAY POSSIBLY EXPLODE THE BIKES BATTERY! It is more likely you'll fry your electrical system or a fuse...it'll be bad!

Don't start the car!

 

Get a charger, you'll need one sooner or later anyway.