BMW K bikes (Bricks)


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Packo

Packo
Silver member
Silver member
On a recent trip the bike was behaving perfectly, started easily in the mornings even though very cold temps overnight. Then one morning after starting easily the Red battery light was a little slow to go out (say 30secs) and thereafter it performed as normal. One quick stop (morning coffee) and again all ok. Travelled 30 Km and then pulled up to regroup and switched off, On restart the battery light stayed on after start up but only as a Glow and not full brightness (maybe 1/2 strength). Continued to watch the glowing red light (sometimes wavering in its intensity but never full brightness) and after about 30 Km the engine spluttered and stalled very similar to running out of fuel.(plenty of fuel in tank)
The battery was flat and after a charge No change. Battery test confirmed it had dropped a cell. New battery and a change of alternator produced no significant change, the starter spins but that is all, I can hear the fuel pump prime and also run for a couple of seconds after turn off. It performs remarkably like when the ECU or Motronic box has become loose from the "monster" plug. All fuses have been checked and ok and all functions of the switch blocks appear to work like indicators brake lights, horn etc
Where to from here please, electronics are not my strong suit, but usually I can follow instructions ok.
Thanks in advance
Mike


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83 K100 HRD Outfit
1992 K1100 Outfit
2003 R1150 GSA Outfit
1983 K100 Basic
    

2Back to top Go down   K1100 battery light came on, engine stopped, now no start Empty Battery light Mon Aug 12, 2024 12:21 am

daveyson

daveyson
Life time member
Life time member
I'm not confident the new battery is a good one, especially if you got it from a place that doesn't have a high turnover of batteries. It might read over 12Volts, but be low on Amps.


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11/1985 BMW K100RT (late model)  Vin. 0090567
 ~120,000 km
    

Packo

Packo
Silver member
Silver member
daveyson wrote:I'm not confident the new battery is a good one, especially if you got it from a place that doesn't have a high turnover of batteries. It might read over 12Volts, but be low on Amps.
I am confident that the batt is fine and it is the second new one I have had on this "project" with the same results. It appears to me there is no spark, I tried sparkplug in the lead earthing onto the cam cover but nothing.


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83 K100 HRD Outfit
1992 K1100 Outfit
2003 R1150 GSA Outfit
1983 K100 Basic
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Which, of your three bricks, is having this problem?  There are differences in the wiring.


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Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

Packo

Packo
Silver member
Silver member
Point-Seven-five wrote:Which, of your three bricks, is having this problem?  There are differences in the wiring.
K1100


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83 K100 HRD Outfit
1992 K1100 Outfit
2003 R1150 GSA Outfit
1983 K100 Basic
    

Packo

Packo
Silver member
Silver member
Fixed - loose plug


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83 K100 HRD Outfit
1992 K1100 Outfit
2003 R1150 GSA Outfit
1983 K100 Basic
    

Dai

Dai
Life time member
Life time member
Which one? Just for future info.


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1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

Packo

Packo
Silver member
Silver member
The ignition amplifier at the base of the battery box


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83 K100 HRD Outfit
1992 K1100 Outfit
2003 R1150 GSA Outfit
1983 K100 Basic
    

duck

duck
Life time member
Life time member
FYI: The most overlooked maintenance item on 93 and earlier K1100, K1 and K100RS4V bikes is the redoing the heat sink compound behind the ignition amp.

http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/ignamp/ignamp.htm


If you've never done this then I highly recommend it. When I bought my 91 K1 it ran OK but after I redid the ignition amp heat sink compound it ran much better and much smoother.

Over the years I've had several people ask for help on bikes that ran poorly when warmed up and redoing the heat sink compound was the solution.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

10Back to top Go down   K1100 battery light came on, engine stopped, now no start Empty Ignition Amp Tue Aug 13, 2024 4:16 pm

ArtK

ArtK
active member
active member
Duck,

Thanks for the insight on the ignition amp heat sink maintenance.

    

Rick G

Rick G
admin
admin
duck wrote:FYI: The most overlooked maintenance item on 93 and earlier K1100, K1 and K100RS4V bikes is the redoing the heat sink compound behind the ignition amp.

http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/ignamp/ignamp.htm


If you've never done this then I highly recommend it. When I bought my 91 K1 it ran OK but after I redid the ignition amp heat sink compound it ran much better and much smoother.

Over the years I've had several people ask for help on bikes that ran poorly when warmed up and redoing the heat sink compound was the solution.
Just to add to this important info make sure the earthing wire on the battery cradle is in good condition as that can and often has stopped K1100s in their tracks by not having an earth on the ignition amplifier.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

duck

duck
Life time member
Life time member
I always wondered why that "extra" little ground wire is there. Makes sense now.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

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