Kawasaki ER6F starting issues

[marlc0]

After a bit of help, the gf's bike seems to have developed a fault on the starting side somewhere, where it's not starting.
Last time it happened was this morning, I've already checked the battery\charging and all seems fine. With the key out, the battery was at around 12.5v, dropped to around 12.2v with the ignition on, and wouldn't start, sounds like the starter was trying, but didn't have enough umphf. Let it charge on the optimate for a little bit, and tried it with 12.5v in the battery with ignition on, and it still wouldn't go, although it was close to firing. It eventually went with a jump start from the other bike.
I'm thinking it's the starter, is there anyway to test this to confirm it? Or is it likely to be something else.
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2010 Kawasaki ER6-f - Given to the Mrs.
2016 Triumph Tiger 800

[Nobby the Bastard]

How did you test the charging system?
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Easy-X]

How old is the battery?
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Nobby the Bastard]

My bet is, if the bike starts using a jump from another bike, the battery isn't kicking out enough juice.

That means it's either the battery or the charging system.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[marlc0]

Multimeter on the battery says it's at 12.5v, sometimes a bit higher, when it's that bit higher, it'll start.
When the bike is running, revs at 3k, it's getting 14.4v as a charge.

It will start on it's own, if it's had a good run, or if it's just come off the optimate, but as soon as the voltage drops slightly, it won't.
____________________
2010 Kawasaki ER6-f - Given to the Mrs.
2016 Triumph Tiger 800

[Nobby the Bastard]

In that case, the battery is fucked. Have you checked if it has caps to refill it? If so, fill it with distilled water and it will probably recover.

If it's sealed, it's time for a new one.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[jeffyjeff]

Check the cranking voltage. It will normally drop below 12v. If the cranking voltage drop to less than 11v, it may crank the engine OK, but not enough to keep the ECM alive.
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History shows again and again how nature points out the folly of men - BOC

[blurredman]

I have a battery that reads relatively okay values voltage wise (12.4v), but the bike stalls when the lights are turned on, and mis-fire when the indicators are on too long.

However, It's still failing- voltages are one thing, but the 'capacity' of a battery is another.

EDIT: Obviously <1,500rpm in my case the charging circuit is not in operation - Hence my own problem.
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CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S.
Current: 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (bored to 295cc) - 38k, 1990 MZ ETZ251 - 49k, 1979 Suzuki TS185ER - 9k, 1973 MZ ES250/2 - 17k.

[Nobby the Bastard]

That sounds more like your charging system than the battery.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[jeffyjeff]

Nobby has a point here. Once the engine has started, the charging system provides 100% of the current used by the vehicle. Charging voltage, being higher than battery voltage, forces current backwards through the battery from positive to earth. The battery becomes just another load on the charging system, like the headlight, taillight, and ignition.
____________________
History shows again and again how nature points out the folly of men - BOC

[marlc0]

Looks like you were right Nobby, fitted a new battery, and it fired straight to life, and i'd noticed it was idling really low and weak until the revs were picked up, this has stopped with the fresh battery.

Cheers for the help!
____________________
2010 Kawasaki ER6-f - Given to the Mrs.
2016 Triumph Tiger 800

[blurredman]

Glad you fixed it marlc0.