BMW K bikes (Bricks)

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audibob

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I went out for a short ride yesterday and half an hour in, the engine died and the red triangular warning lamp came on.

My reaction was to press the rear brake pedal, which extinguished the red triangular light, and the power came back.

I initially thought that the back brake had came on via the ABS, which is why I pressed the back brake pedal.
but then realised I had lost all power momentarily.

I rode for another half an hour, then whilst coasting to a stop light, the bike died again with the red triangular light coming on.
I pressed the starter and she instantly fired up, and I got back home with any further problems.

Recent maintenance as follows.

1. 50 amp alternator and new motobatt battery fitted.
Battery charge indicator bulb then flickered occasionally for 50 miles or so and steady after with a good charging rate
ABS lamps began to stay on now and again after operating both brakes, so swapped ABS brain for known good spare, ABS lamp goes out every time .

2. speedo signal failure from rear drive sensor.
No problems since.

I noticed that when I switched the ignition on, the instrument lights were just about visible. Turning the key back and on again, the lights were as they should be. I could feel the switch was a liitle rough when moving it slowly

Obviously my first port of call will be to clean / replace the ignition switch.

My question is, why did the bike power come back the first time, when I pressed the rear brake pedal which extinguished the red warning triangular light?

Would dirty contacts in the ignition switch do this?

Have ordered a can of deoxit equilavent.

Bob


__________________________________________________
Yamaha 90
Honda CD 175
Honda CB 360
Triumph T 140V Bonneville
Triumph T150 Trident
Honda CB750 F1
Cz 175
Yamaha XS 750
R 100/7
R 80
K100 LT
K100 LT current bike
    

Chocolate

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Only a few activities make me experience my senses in a way motorcycle riding does, it is like swimming in the nude in a river.
K75 BA/1992 ABS, K75 BA/1991 noABS, Ducati, Mobylette M1/1973
Pictures:Me my bike and I
    

Holister

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Audiobob wrote:....
My question is, why did the bike power come back the first time, when I pressed the rear brake pedal which extinguished the red warning triangular light?
....
I think instead you should be asking "why did the red triangular warning light come ON when the bike power cut out"?

The red triangular warning light is the warning from the Bulb Monitoring Unit (BMU) for the tail light. It also comes on when you first switch the ignition on which you cancel with a depress of both brake levers. If lights remain on a bulb is blown.

You probably know all this, but the point is that what's happened is the ignition has gone off momentarily which has reset the BMU and when it comes back on straight away due to the intermittent fault, the warning light comes on just the same as if you'd turned on the ignition. This was undoubtedly caused by the failure of the ignition switch. The brake lever was not restoring power. The power was already back on before you pressed the lever.

It's a common problem. The ignition assembly needs to be removed, disassembled and cleaned. You'll probably find it in good condition because it's been packed with dielectric grease at the factory, but the grease goes hard after time.
WARNING: Small parts may cause choking hazard. Only for ages 3 years and over. What a Face

Cleaning a BMW K bike ignition switch

Inside the ignition switch

Intermittant poor running engine


__________________________________________________
1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

audibob

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Thanks for the replies,

Chocolate Holister

I will take the unit apart as per Don Eilenberger

plus clean all related connectors

Hopefully this will cure it.

Thanks again

Bob


__________________________________________________
Yamaha 90
Honda CD 175
Honda CB 360
Triumph T 140V Bonneville
Triumph T150 Trident
Honda CB750 F1
Cz 175
Yamaha XS 750
R 100/7
R 80
K100 LT
K100 LT current bike
    

indian036

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audibob wrote:Thanks for the replies,

Chocolate Holister

I will take the unit apart as per Don Eilenberger

plus clean all related connectors

Hopefully this will cure it.

Thanks again

Bob
It did for me. Very Happy

Bill


__________________________________________________
1985 K100RT Red. VIN 0028991K100RT ENG 104EA248523386
1985 K100RT Blue. VIN 0029036K100RT ENG 104EA25852071
1990 K100LT Black. VIN WB105060310190452
1984 K100RT White. VIN. 0023022K100RT ENG 104EA32848523
    

Point-Seven-five

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+1 on the ignition switch. On my bike it triggered a low voltage fault in the ABS that had to be reset. Those switches are not the best design and aren't terribly dirt/corrosion tolerant.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

audibob

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Hi all,

I have now done over 400 miles since I cleaned and lubricated my ignition switch and hey ho, no more problems
All other electrical connections have now been checked for good measure,
so happy days again
Bob


__________________________________________________
Yamaha 90
Honda CD 175
Honda CB 360
Triumph T 140V Bonneville
Triumph T150 Trident
Honda CB750 F1
Cz 175
Yamaha XS 750
R 100/7
R 80
K100 LT
K100 LT current bike
    

Laitch

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Life time member
audibob wrote:
I have now done over 400 miles since I cleaned and lubricated my ignition switch and hey ho, no more problems.
Thanks for the update! cheers


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1995 K75T 60,000 miles
    

Point-Seven-five

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cheers


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

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