Can I jump start my bike off a car battery?

[jjr1]

Bike is not near a power socket so I can't trickle charge. Can I just jump it off my car?

[phillvr6]

I've done it before

[phillvr6]

My previous topic:

http://www.pistonheads.co.uk/gassing/topic.asp?h=0...

[jjr1]

Cheers I will give it a go off the car with the engine turned off.

[Moulder]

Don't see why not. I have actually started my car off the motorbike and was amazed that that worked.

[Hooli]

as long as its 12v for both then no problems.

[crofty1984]

I don't know if you should, but I have done.

[Steve_T]

Sure you can. Don't do this with the engine running.

Steve.

[Carbon-Me1]

I have, had no problems was a bit tricky getting large car jump leads onto my bikes battery though.

[Amused2death]

Carbon-Me1 said:

I have, had no problems was a bit tricky getting large car jump leads onto my bikes battery though.

Whenever I needed to do this,access was awful, so negative to the frame, positive attached to a large metal screwdriver held onto terminal(handle insulated) worked a treat and no risk of shorting out due to large crocodile clips touching in confined space

[Howitzer]

I also thought this was perfectly fine but it ruined the diodes on my Datatool Stealth alarm, which I subsequently had to remove. It also damaged the diodes in the starter module.

Now this could have been due to an existing fault, but i've heard a few people say it can cause alarm problems.

Dave!

[dern]

Howitzer said:

I also thought this was perfectly fine but it ruined the diodes on my Datatool Stealth alarm, which I subsequently had to remove. It also damaged the diodes in the starter module.

Now this could have been due to an existing fault, but i've heard a few people say it can cause alarm problems.

12v is 12v whatever size battery it comes from. You either connected the battery the wrong way round or there was another fault. I just had to jump start the blade of my impreza because it's been in the garage for a week off the charger... connected it up like everyone says without the car engine running and it started straight up.

[dern]

Amused2death said:

Carbon-Me1 said:

I have, had no problems was a bit tricky getting large car jump leads onto my bikes battery though.

Whenever I needed to do this,access was awful, so negative to the frame, positive attached to a large metal screwdriver held onto terminal(handle insulated) worked a treat and no risk of shorting out due to large crocodile clips touching in confined space

That's a bloody good idea.

[Amused2death]

dern said:

Amused2death said:

Carbon-Me1 said:

I have, had no problems was a bit tricky getting large car jump leads onto my bikes battery though.

Whenever I needed to do this,access was awful, so negative to the frame, positive attached to a large metal screwdriver held onto terminal(handle insulated) worked a treat and no risk of shorting out due to large crocodile clips touching in confined space

That's a bloody good idea.

Thats working on Goldwings for ya, a lot of bike, but a pain to work on (A3/A4)

Edited by Amused2death on Sunday 2nd March 11:26

[Howitzer]

dern said:

Howitzer said:

I also thought this was perfectly fine but it ruined the diodes on my Datatool Stealth alarm, which I subsequently had to remove. It also damaged the diodes in the starter module.

Now this could have been due to an existing fault, but i've heard a few people say it can cause alarm problems.

12v is 12v whatever size battery it comes from. You either connected the battery the wrong way round or there was another fault. I just had to jump start the blade of my impreza because it's been in the garage for a week off the charger... connected it up like everyone says without the car engine running and it started straight up.

I agree completely. It was when it was mentioned by a bike alarm fitter on here that it can cause problems that I delved deeper.

Dave!

[YamR1V64motion]

if its a modern FI bike you would be surprised how easily they will bump start from cold.

[Who me ?]

Howitzer said:

dern said:

Howitzer said:

I also thought this was perfectly fine but it ruined the diodes on my Datatool Stealth alarm, which I subsequently had to remove. It also damaged the diodes in the starter module.

Now this could have been due to an existing fault, but i've heard a few people say it can cause alarm problems.

12v is 12v whatever size battery it comes from. You either connected the battery the wrong way round or there was another fault. I just had to jump start the blade of my impreza because it's been in the garage for a week off the charger... connected it up like everyone says without the car engine running and it started straight up.

I agree completely. It was when it was mentioned by a bike alarm fitter on here that it can cause problems that I delved deeper.

Dave!

Suggestion - disconnect one side of bike from battery - put jump leads to car battery , start car ,and leave to idle for a little while ( hence charging bike battery ) ---take leads off and try starting bike .

[dern]

Who me said:

Suggestion - disconnect one side of bike from battery - put jump leads to car battery , start car ,and leave to idle for a little while ( hence charging bike battery ) ---take leads off and try starting bike .

Hmmm, dunno if I'd try that. The concern would be the specification of the bike vs car alternator. You could easily check though by measuring the voltage across the battery with both running to see what the charging voltage is and it should be ok but I'd check first.

Edited by dern on Sunday 2nd March 20:35

[dern]

YamR1V64motion said:

if its a modern FI bike you would be surprised how easily they will bump start from cold.

The thing that always puts me off doing that (and I live on a hill so it's crossed my mind a few times) is that I'd have to push it back up the hill if it didn't start

[jjr1]

dern said:

YamR1V64motion said:

if its a modern FI bike you would be surprised how easily they will bump start from cold.

The thing that always puts me off doing that (and I live on a hill so it's crossed my mind a few times) is that I'd have to push it back up the hill if it didn't start

Same problem here as I would have to push it up a hill to start it.

Good news anyway as it has started without any outside assistance, unlike my old blade which needed help all the time.