BMW K bikes (Bricks)


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1Back to top Go down   Suspected Electrical Issue Empty Suspected Electrical Issue Thu Oct 26, 2023 7:54 am

Robert Crisp

Robert Crisp
New member
New member




https://youtu.be/-nEePcFnZ44?si=Y2eEVp9JmfSuspt7

https://youtu.be/cgyevs_LAAg?si=KuZT17PpDxx6qKJJ

First post, sorry I don't really know what I'm doing posting. Hoping the video links to YouTube work to show what's going on.

'83 K100. Assuming something electrical going on. I spent 5 minutes trying to start it before this. I'd hit the ignition and the taco would just flip out, starter would not engage. The few times it did it would fit/flip out then stall.

This was a very intermittent issue at first with very brief cut outs while riding, then it gradually became very prominent to the point where it won't start.

Is there a known issue that causes this behaviour? TIA

    

2Back to top Go down   Suspected Electrical Issue Empty Re: Suspected Electrical Issue Thu Oct 26, 2023 8:11 am

Dai

Dai
Life time member
Life time member
Let's go for the simple bit first: pull the HT leads and check for copper carbonate (green stuff) on both inside the plug leads and inside the coil towers. When you switch on, it's pretty much a given that one of the plugs will be in the firing position and if the leads are corroded, it produces all sorts of funnies. Although early coils are prone to cracking and shorting, I'm not willing to point you down that route yet. You can, however, try the whole sequence in the dark and see if you are getting blue sparky bits around the coils. The tacho is playing stupid because something down in the coils is playing stupid. It's driven from coil 1-4 (the forward one).


__________________________________________________
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
    

3Back to top Go down   Suspected Electrical Issue Empty Re: Suspected Electrical Issue Fri Oct 27, 2023 4:58 am

92KK 84WW Olaf

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Life time member
I'd hit the ignition and the taco would just flip out, starter would not engage.

What does this mean? Starter whirrs but does not engage??


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

4Back to top Go down   Suspected Electrical Issue Empty Re: Suspected Electrical Issue Fri Oct 27, 2023 9:10 am

Two Wheels Better

Two Wheels Better
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Moderator
You've posted in Forum Functionality, which is not even remotely where it should be, and is a real bugger to move to the correct forum section. The original poster ought to be more selective in future, and should've used Electrical Troubleshooting.

Calling RickG if you're healed enough to look into it. Ta.


__________________________________________________
1977 R75/7-100, 1995 R100 Mystic, 1993 & 1996 K1100RS, 1993 K11/K12 Big Block, 2 x 1998 K1200RS, 2006 K1200R & 2009 K1300GT
    

5Back to top Go down   Suspected Electrical Issue Empty Electrical issue Fri Oct 27, 2023 4:06 pm

daveyson

daveyson
Life time member
Life time member
Something else, I don't feel confident about the coil for cylinder's 1,4. Does it make a buzz sound, or a buzz disappears when it's primaries are unplugged, or a buzz from the relay box? 

It might be sneaky enough to pass the coil tests, since it's intermittent, but if the coils are swapped, the tacho problem might disappear.

Actually since it took a while to start, maybe it's only intermittent when it's warm, and the coil or coils do fail simple tests when cold.

On the tech page of this forum is a troubleshooting part that describes how to test the coils.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

6Back to top Go down   Suspected Electrical Issue Empty Re: Suspected Electrical Issue Fri Oct 27, 2023 9:22 pm

Rick G

Rick G
admin
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Two Wheels Better wrote:You've posted in Forum Functionality, which is not even remotely where it should be, and is a real bugger to move to the correct forum section. The original poster ought to be more selective in future, and should've used Electrical Troubleshooting.

Calling RickG if you're healed enough to look into it. Ta.
All Done


__________________________________________________
"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 2004 K1200GT (crashed I lived it died) 1999 K1100 LT.
    

7Back to top Go down   Suspected Electrical Issue Empty Electrical issue Sat Oct 28, 2023 5:26 am

daveyson

daveyson
Life time member
Life time member
I forgot to add, let's say tomorrow morning, with the engine cold, it again takes five minutes to start, this would be a good time to make some checks. One easy thing would be to put a timing gun on the high tension leads to see if one or more of the plugs isn't giving sparks, or missing sparks in time with the engine missing.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

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