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+--- Thread: flat battery (/showthread.php?tid=12232)
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flat battery - Busaben - 08-05-2009
Went to start my k7 in the morning after riding just the day before without a problem ,but she was a no go ,so i role started it down the hill from my place and went to work the speedo was stuck on 40km on the way and the battery was dead when i got there, so changed it with new one at lunch ,and it started good and the speedo came good to.On my way home in the arfternoon it started good and was running fine ,got about half way home at a set of lights noticed it was running ruff and the speedo was stuck again then it just stoped 
after checking the battery terminials and trying to run start with no luck i had to push it to a safe place (one houraway) Does anyone have any idears on what my be wrong ,i have it at sydneyDano with Dave Holdforth he has not had a chance to look at it yet ,he said he would charge the battery up ,get it going and see if the battery was getting charged and go from there. Any ideas would be welcome.
RE: flat battery - andcad - 08-05-2009
Busaben Wrote:
Check for any shorts or burnt wiring at the heat sink
RE: flat battery - Busaben - 08-05-2009
[/quote]
Check for any shorts or burnt wiring at the heat sink
[/quote]
sorry mate whats the heat sink?
RE: flat battery - andcad - 08-05-2009
Check for any shorts or burnt wiring at the heat sink
[/quote]
sorry mate whats the heat sink?
[/quote]
Its a large aluminimum block with fins on it, its on the side under the rear fairing. cant remember which side
RE: flat battery - ROD - 08-05-2009
buy a cheep multy meter and check voltage when bike is running should be puting out about 14.6 volts ,as unlike a car a bike want run with the battery dead flat so my guess is its not charging your battery
So start with checking all wires (good earth) and back to your charging side regulator etc
RE: flat battery - BUSGO - 08-05-2009
I had exactly the same symptoms when my battery died.
By removing the earth terminal the speedo resets and it is all go again until you run a bit flat again.
A new battery should fire it back but also check the connections to your regulator which is the heat sink that andcad refers to.
RE: flat battery - Maj - 09-05-2009
Regulator connector plug should be your first check, look for burnt or heat affected connector, you can replace the terminals if damaged , common at many autoelects
RE: flat battery - 1hotbusa - 09-05-2009
Hi there,
I have had exactly the same problem as you, except it left me on the side of the road miles from home.
I had the plug that connects to the regulator rectifier melt down. This also took out the regulator so it would not charge. I think that my battery may have been on it's last legs, so it may have been continuously charging.
You will need to remove the seat, and then the rear duck cowl fairing. On the left hand side you will see an aluminium heat sink. This is the regulator/rectifier. On a short lead coming out of the reg/rec you will see a black plastic plug. Check that it is a) not disconnected or b) melted down.
If it has melted down you will need a new reg/rec. While you have the duck cowl off, recharge the battery and run the bike. The plug from the motor non reg rec side has 1 row with 2 pins, and 1 row with 3 pins. The row with 3 pins is the alternator output and should be approx 60VAC across all three pins. If this is so, then the alternator is ok.
I think you may be up for a new reg/rec personally. Are you in Sydney mate, if you need a hand drop me a PM and I'll send you contact details. I may be able to help.
RE: flat battery - Landmine - 09-05-2009
My K8 battery failed after 11000 Kms. Would start when cold but was unable to start after stopping to take fuel. The voltage with engine stopped was 13.4 V and with engine running it was 14.2 V so concluded charging system was ok. A discharge test showed battery to be lacking. As there is no warranty cover on battery bought a new Gel battery on internet. No problems starting now. Battery purchased from All Purpose Batteries on Line. Choose the GEL battery as it has higher cranking amps, comes charged, there is no need to fill battery then charge and was cheaper than I could buy locally.
I never mess with an unreliable battery too frustrating.
Check the running and none running Volts, check discharge rate and this will in most cases show whether the problem is battery or charging problem.
RE: flat battery - Landmine - 09-05-2009
Just on Gel batteries they have advantages. Is any one else using one?
Totally sealled so elliminates maintenance apart from terminals.
The lack of free electrolyte reduces resistance and produces 25% more cranking amperage.
The 2% monthly self-discharge rate means your bike can sit for extended periods without constant monitoring or recharging.
RE: flat battery - BUSGO - 09-05-2009
Just out of interest, the K8 should have come with a gel one in the first place.
Do you know why yours didn't?
RE: flat battery - Landmine - 10-05-2009
BUSGO Wrote:Just out of interest, the K8 should have come with a gel one in the first place.
Do you know why yours didn't?
I still have the battery at home, at the time I did not look into it too much. Was a little disappointed in battery life at time of replacement. The K8 is used regularly and at least a 30 km run. The battery was a Yuasa and was sealed so guess it is likely to be a Gel type. I will take a second look into it and report.
RE: flat battery - BUSGO - 10-05-2009
Yeah that sounds like the stock one if it is a Yuasa and sealed unit.
Must be something wrong though for it to die so soon.
Do you have any aftermarket accessories fitted to drain the juice or anything.
Maybe a loose terminal or plug somewhere.
RE: flat battery - Landmine - 10-05-2009
BUSGO Wrote:Yeah that sounds like the stock one if it is a Yuasa and sealed unit.
Must be something wrong though for it to die so soon.
Do you have any aftermarket accessories fitted to drain the juice or anything.
Maybe a loose terminal or plug somewhere.
Had a look this morning and it is GS Yuasa YTX12-BS looks like its the right one.
Happened about a month ago and new battery has been performing ok. At the time I charged the battery over night on an independent charger before performing a crude car head light load test. the voltage fall away very quick so I am pretty sure its a battery problem.
RE: flat battery - BUSGO - 10-05-2009
Be careful charging bike batteries with a car charger.
They cannot stand the rate for more than a couple of hours.
Bikes batteries generally charge at about 0.4ma for up to 4 hrs only.