Jump starting motorbike

[Fat Angry Scotsman]

My ER6F hasn't been used in a couple months and the battery is dead, so I went to open the cunt up and trickle charge the battery back into life but as life likes to drop kick me from time to time the seat lock was jammed.

Tried to open it and broke off the spare key in the lock. So now I am going to cut in through the seat from the top with manually toggle the latch to get the seat off (bin the fucked seat and put on the old one that I replaced with it) but then I seen that you can't buy a replacement lock just for the seat (and run with two keys) so fuck me more I need to get a full kit including an ignition I'm not going to change.

Anyway, so when I break the seat off this cunt is it possible to jump start the thing using either a car 12V battery (car running or not) or my 125cc battery (12V but it's tiny):

This is the battery in my 125cc:

https://bs-battery.com/product/bt12-10z-sla/

This is the battery in the diesel car I could use:

https://www.yuasa.co.uk/ybx5019.html

or should I just pull the battery out of it and put it on a trickle charger?
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PRESENT: 2018 BMW S1000XR SE Sport.
PAST: 2009 Kawasaki ER-6F. 2021 Zontes ZT-125U.

[Polarbear]

12v is 12v. Stick the jump leads on and press the tit. I know people will come out with some convoluted explaination of why you shouldn't but I've jumped a motorike from a bank of 4 leisure batteries on my boat and nothing went bang.
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Triumph Trophy Launch Edition

[Robby]

Get the broken-off bit of key out of the lock. Lubricate the lock. Get a new spare key cut. Open the lock.

Then fit some optimate fly leads to the battery so you can charge it without removing the seat or taking out the battery.

You can jump it from any 12v battery, but if the battery is flat you then need to ride it for about 5 hours to charge it back up. So you need to get it on a charger for about 10 hours really.

[Fat Angry Scotsman]

[Robby]

You appear to have a lock, cable and latch forming the whole mechanism. So the lock itself may be fine, it could be seized elsewhere. Get some penetrating oil into the whole assembly.

If you're careful you may be able to detach or cut the cable and pull on in with a pair of pliers to release the seat.

[Fat Angry Scotsman]

[WD Forte]

I've jump started bikes off cars and vans many's a time
just observe correct polarity and them big jump lead croc clips
don't get shorted on bike frame parts.
If the bike battery is dead flat I'll sometimes connect it up
start the car and let it idle for few minutes before trying to start it

Why? cos engine stopped = car battery at say 12.5V-ish

connect to flat battery this 12.5V goes lower as batteries try to equalise

engine running at 14V = moar eleckrikule power midgies get stuffed in bike battery
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bikers smell of wee

[grr666]

Your battery may be beyond charging. Due to the somewhat rare usage of my departed MT09 it had three batteries
over the 6 years and 3000 miles I had it for. The charger wouldn't recognise that there was even a battery attached,
even piggybacking it off another functional battery to get some charge into them I had no joy I've been a bit more
careful to top up the battery on my MT10 over the winter.
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Currently enjoying products from Ford, Mazda and Yamaha
Ste wrote: Avatars are fine, it's signatures that need turning off.

[dave001]

you can use any 12v batt that supply's enough amp/current

it don't mater if a 10,000 amp batt, it will only draw the current needed, unless there is a short

get a optimate and leave on there, it may also revive the old batt. If it is not to far gone.

[MarJay]

Don't run the car/van/large vehicle when jumping the bike off of it, as you may fry the bike battery. It's perfectly OK to jump off of a larger 12V battery though, that's what a jump start pack is.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[dave001]

[grr666]

[doggone]

I'd try it hooked to car without it running first but can't see any real problem.
I suppose there's a chance that running it with essentially non-functioning battery will fry something else in the charging system.
If you've established it is going to need a new battery as it won't charge why not just fit one anyway and avoid any firey inferno or whatever else might happen.

[stinkwheel]

If you hook it up to a car battery, it'll crank it over like the wind.

Don't run the car engine with it connected to the bike because there's a chance the bikes reg/rec might try to regulate the car alternator output (depending on if it's set higher than the bike). The alternator will then just keep upping the output until it either hits its own upper limit or the bikes reg/rec craps out.

If you can hook the seat cable outer somehow and yank on it, the seat should release.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[dave001]

[Pete.]