Can you jumpstart a bike battery from a car?

[Fallen Angel]

As long as the voltage is the same?
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I have an asshole tolerance level of -10
www.cliqueyclanmcc.co.uk
www.bebo.com/fallenangelfran

[Kickstart]

Hi

Short answer is yes.

Long answer is:-

https://www.bikechatforums.com/viewtopic.php?t=35904

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Guest]

Yes, but there are some important things to remember.

If you accidentally 'short' a battery (connect the neg side to the pos side) you will generate a very large electric current. This can cause a fire or even explode the battery. It will certainly melt the jump leads. You need to keep the un-insulated clips on both leads well apart.


So...


Lift bike seat (assuming the battery is under there) and car bonnet.

Connect the red jump lead to the red (+) terminal on the bike battery 1st. Then connect the other end to the red (+) terminal on the car battery.

Make sure this lead cannot come into contact with any metal on the bike or the car while you're connecting them or while you're trying to start the bike.

Now connect the black jump lead to something metal on the bike - I use the rear wheel nut (this is to keep the two leads apart on the bike as there's not much clearance around a bike battery). Connect the other end of the lead to the Neg (-) terminal on the car battery.

Now try and start the bike. If it won't go and starts to drain the car battery you can start the car but let it just tick over, do not rev it.

When the bike's running (or you've given up ) disconnect the black lead from the car battery and then from the bike. Then disconn the red lead from the car and then from the bike. Do not let this lead touch anything metal while you're disconnecting either end.

[Kickstart]

[Silver 0wl]

cheers guys
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www.cliqueycuntsmcc.co.uk
Smoke them if you got them, if you ain't got them, then go get them!

[hawkeye]

Ever seen a spanner across a battery? Turns it into a light bulb
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'89 R/W/B NC30
'The car in front is... in my way'

[Fortuna]

Done it loads of times. I keep a spare car battery in the shed for winter or when my bike battery is low

[BLOFLY 636]

[Fortuna]

[Kickstart]

As above, but the main thing you are shorting out is the battery on the bike. Would have much the same effect if you shorted the +ve bike terminal to the frame.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Valentino Mossy]

[mchaggis]

[mr.z]

How does anyone with electronicly controlled fueling go about it? i've heared of people frying ecu's changeing baterys over, or just clearing them out...
Just wondered is all...
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>RidingSkills<->Tech Tips<->MyBikes<

[Big Pete]

There are small power supplies that you connect across the battery terminals before dissconnecting the leads, they do about 1 amp at 12v, which keeps ecu and radio memories alive. They are usually called "ecu saver" or similar.
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Trust me, I`m an engineer
GarageOfPower.co.uk

[Kickstart]

Hi

There can be occasional problems swapping batteries. BMW 3 series can apparently fry the clocks when you change the battery. More worrying is that it is not unknown for it to trigger the airbag occasionally on some cars when you reconnect a battery.

Biggest problem with the ECU is likely to be that most modern ones use the feedback from the lambda probe to adjust the fueling themselves for future use, so when you disconnect the battery the system defaults back to its standard (rather poor) mapping.

There are plus point to this. Apparently the old Volvo 850 T5 would land up mapping itself quite poorly if they were used slowly. Quick fix was to disconnect the battery for a short while, connect it back up and then go and thrash the knackers off it.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[freestyler_onli]

Can you jump start if it's cold.

[Git]

One small point I would like to say is you can only jump start a 12v bike from a car, jump start a 6v bike from a 12v system and you will fry stuff.

[clemsta]

Fallen Angel, why do you want to know this, the NS125R doesn't have a electric start so you shoudn't need to charge the battery unless it is totally goosed and won't even bump start, try testing the alternator to see if it is chargeing properly, you do this by having the bike running, connect a volt meter between +ive and -ive terminals, it should read about 14V if it's charging correctly. If it's ok then you need to test the battery, it's probably knackeered unless the bike has not been started for a long time.

Hope this helps

Adam
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SOMEONE CALL THE DOCTOR! I've got 2 stroke fever!!!
OGRI - Stuff everything, i've always got my bike!
DAS Passed - 7/6/06

[Minky_monkey]

I went out to a guy that jump started a Jaguar with a BMW, he stuffed both ECU's. The Jaguar one was £2000. Ouch!

The only way I jump cars these days is with a Boost pack, I'd never do it off a running vehicle now.

I had a peugeot 406 diesel that had been jump started and then you couldn't turn it off! I think he'd shorted the alternator.

[Big Pete]

[Fallen Angel]

[Kickstart]