Jump start

[chris vtr virgin]

As you will maybe already know I have a flat battery
New one comes next week
What's the thoughts on jump starting it of the car

[VTR Phoenix]

I have but they say you shouldn't.

If you decide to then DO NOT have the car running. If you do it could fry your ECU.

[wall.j]

Yes, it's fine as long as the vehicle isn't running. The vehicles charge voltage is too high for the motorcycles ECU and other components and could cause damage. In theory, you'd just be connecting a battery in parallel.

[Saintsman27]

I agree... remember + to battery + lead peg .... - to ground say rear brake disc ,, not the -
terminal .. best way... or if you can just wait 7 x 24 hrs ... lock it up and walk away come back with
your new battery.... good time to check your wiring with your acme avometer

[darkember]

If you are feeling energetic then bump start it

[tony.mon]

What?
Is a car battery's voltage higher than a bikes?

(answer- no...)

The reg/rec works in exactly the same way, the voltage going into a car battery is the same as a bike's.

Assuming that the car's reg/rec isn't faulty, there's no problem at all.
And any higher voltage going in th the bike should be shunted to heat by the bike's reg/rec, just the same as the 25+ volts that the bike's alternator produces at full revs.

You shouldn't need to have the car's engine running, but iI wouldn't have thought it would do any damage if it is.

[mwkeats]

Hi guys,

I wouldn't have the car running. Some vehicles (like mine) have a calcium battery which I believe does require a slightly higher voltage to charge. That isn't really the issue though. If the bikes RR attempts to shunt and the car is running, the car will see it as a load and compensate. Your poor bike's RR will be trying to dump all the current the car can produce which will likely be more than it can handle. In short (pardon the pun), don't take the risk having the vehicle running.

As for a good earth, choose a location on the engine preferably (like the bolt where the battery earth cable attaches). I'd avoid running current through bearings so not use the swingarm or brake rotor etc.)

Cheers

[agentpineapple]

because I'm away from my bike for longish periods of time, I have to jump start it every 4 weeks or so, I always have s couple of spare fully charged car batteries indoors, I just use use of them, never had an issue, well that's not true, one time I used a metal table to put the car battery on whilst jump starting the bike, it started with no issues, other than a massive backfire lol. but when I removed the leads from the bike, I didn't realise that i'd put them on the metal table, it wasn't until I saw smoke, turned around to find the table was on fire...
quickly removed the leads and the fire went out, lesson learned doh!!!!

[Stormin Ben]

Am I being thicky here?
If the battery negative is attached to that bolt on the engine anyway, why wouldn't you just attach the negative to the battery negative?
Its not like the bike is actually earthed anyway as last time I checked two big rubber hoops dont conduct electricity that well!!

[Stratman]

I've used the car to jump the bike on occasions and have always had the car engine running and it's never caused a problem

[wall.j]

If you use the bolt or another point on the chassis, it adds resistance to the load. The higher the resistance, the lower the current that will flow. I'm only a trainee sparkie, so can't go more in depth than that, but I think that's why.

[redpig]

Ive jumped my old FS plenty of times due to a battery drain caused by a corroded connection to the starter.
Used a portable battery pack, didnt seem to be a problem

[AMCQ46]

You want a jump start..... Try moto2

[turbo_billy]

You want a jump start..... Try moto2