BMW K bikes (Bricks)

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leooo

leooo
active member
active member
Hi everyone,

So I just bought this K100RS1 and everything is going smoothly but for the battery that has issues for the first 4-5 minutes of driving.

The bike start easily but if I let it idle for too long, the battery indicator lights up and the bike will power off. Same for when I am riding, if I arrive at a red light, the bike would switch off while I activate the clutch. I need then to restart it, it works but it is not very convenient.

I bought a new battery, that I charged fully with a charger and the issue was solved for 2 days. Then, it started doing it again. As soon as the bike as been riding for 4 or 5 minutes, all is good, the idle is good, no more battery light on the dashboard.

Did anyone experienced the same issue or has any advices to give? It is something that drains the battery while the bike is parked?
Thank you for your help !
Léo

http://www.theroyalsilkroad.com
    

Arlina

Arlina
Life time member
Life time member
The only thing lurking is the clock, but with a good battery it takes more than 4 weeks to notice the voltage going down.
When bike is running, at 1500RPM, the voltage on the battery should be around 14.4V.
If less than 14, time for a new regulator.


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The battery is draining itself when not used? Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde
    

charlie99

charlie99
VIP
VIP
The battery is draining itself when not used? 112350


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OThe battery is draining itself when not used? Au-log10
    

robmack

robmack
Life time member
Life time member
Is the bike stock?  Or have there been modifications done to the motorcycle, such as cafe-ing it, adding aftermarket electronics, etc.?

Does the headlight come on when you turn the ignition key to start position and turn off when cranking the engine?


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Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

Basic2

Basic2
Platinum member
Platinum member
Hi Leo,
Do you mean the engine is stalling when you stop at traffic lights when the engine is still cold, but the problem doesn't occur when the engine is warm?
What RPM does the engine idle at when cold?
Richard.


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K100 Basic 2
11/1987 6308319K100CJ
Marakesh Red
    

td5

td5
Gold member
Gold member
As Arlina says the clock is always on, but it is digital and should not really pose a problem. There isn't an anti theft system fitted?. I would use a battery tender, Ctek make some good kit, it will give you more life from your battery.
Cheers
Mike


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The battery is draining itself when not used? K_engi10
1988 / K100RS
2013 / R1200GS
2015 / K1300R
    

Poupy

Poupy
active member
active member
What about the spark plugs and HT wires? Poor sparks might explain your problem when engine is cold.

Which type of spark plugs do you use? Resistive or not resistive? (with a R in the code?).

How old the HT wires?

    

moriarti

moriarti
Silver member
Silver member
I would be inclined to fit an AMP METER in order to have a LIVE reading of this problem.You can then 
have a true indication of whats happening,or if you have a spare alternator fit it and see if this works 
better. Idea


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1984 k100 rs red/black VIN  0004449
    

K75cster

K75cster
Life time member
Life time member
Those symptoms sound like a dirty starter, perhaps you don't know but the starter is used as a pathway for the motor when not doing start duties. Engine issues just like you describe are mentioned in here many times in the past. Clean the commutator and brushes and you may find it fixed. If you start in on it replace the earth strap to the gearbox with a larger one also for good measure. Just the things done in the past.


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt 1992 K1100LT a blue one

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

robmack

robmack
Life time member
Life time member
@moriarti wrote:I would be inclined to fit an AMP METER in order to have a LIVE reading of this problem.You can then 
have a true indication of whats happening, or if you have a spare alternator fit it and see if this works 
better. Idea
That won't help to solve the problem.  Leakage currents that cause battery drain are measured in milliamperes and a normal ammeter measures amps.  It won't be sensitive enough.  Furthermore, you'd have to fit any current measuring device in the path of the leakage and he doesn't know where that leakage is occurring; so how does he know where to place the meter?  

If the OP wants to track down a leakage, he'll have to do the following:
1. Remove all of the fuses from the fuse block and any auxillary fuses that may be part of aftermarket equipment installed on the motorcycle.  Set the ignition off and remove the ignition key.

2.Insert a multimeter in series with the ground lead of the motorcycle.  Put the multimeter in current reading mode and on a sensitive scale like 200mA.

WARNING:  At no time should you try and start the motorcycle, or turn on any circuit on the motorcycle.  You will destroy your multimeter.

3. read the residual current being drawn from the battery.  Is should only amount to 20mA or so as this is the current that is drawn by the clock.  If the reading is higher than this, the problem is a leak somewhere in the non-switched circuitry of the motorcycle

4. if the reading is OK, insert one fuse at a time and measure the current.  if it suddenly jumps, the cause of the leakage is in that circuitry downstream of the fuse that just got inserted.


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Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

RicK G

RicK G
VIP
VIP
ABS if fitted can come up with faults that drain the battery. It took me a long time to find the problem because as soon as I disconnected the battery to check for parasitic current the fault went away until the ABS was reset.


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

robmack

robmack
Life time member
Life time member
OP's k100 is an 1983 vintage. No ABS installed.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

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