BMW K bikes (Bricks)

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Redman4x4

Redman4x4
active member
active member
Hello everyone!
My name is David and I purchased a 1988 K100LT about 6 months ago in non-running condition from a gentleman whom I used to work with. I got it running and drove it for 4 months but it has a new problem that I am trying to resolve. I absolutely love the bike and appreciate all the help you all have to offer here. Hopefully I can be of assistance to someone in the future as well. Thank you for having me in this forum to participate here.

Have a great day,
Dave

    

Chocolate

Chocolate
Life time member
Life time member
Good to have you here Dave!
Mauldin (South Carolina) must be a nice place to bike.
Enjoy your rides and let use see in a other thread what we can do to keep her running.

Cheers from Germany


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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
    

duck

duck
Life time member
Life time member
WelKome!

What are the symptoms of your current issue?


__________________________________________________
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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

Redman4x4

Redman4x4
active member
active member
Thanks for the reply Duck.
I found a thread that seems to be what I am needing. The engine sputters and backfires after it gets warm. So far I'm interested in the hall effect sensor and have it apart to check the voltage but need to find the diagram that crazy frog had posted many years ago. It seems that it is no longer available through the link he posted. I did order two sensors off ebay that I cross referenced from the old Honeywell part number. I think they are coming from Bulgaria so I can splice those in when I get them but I would really like to know if this is truly the problem before cutting wires. Any idea where else I can look for the PDF file crazy frog had made a while back?

    

MartinW

MartinW
Life time member
Life time member
Also check the fuel return line where it goes into the tank. If the line is non OEM it can crimp over causing the symptoms you are experiencing. It can be hard to determine that this is occurring as when you slide the tank backwards the line uncrimps itself. The crimping over is exaggerated by hot weather due to the softening of the hose.
Regards Martin.


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K75s Hybrid
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Not sure it will help, but you might want to wiggle the wiring harness for the fuel injectors.  One of my bikes was acting up the other day when I was running them in the garage to charge the batteries and circulate the oil.

As I poked around, I bumped the connector on one of the injectors, and the engine stumbled.  Wiggling it a bit more I could make the engine smooth out or stumble.  Took off the connectors and cleaned them with Deoxit.  Problem fixed.

I have been through almost every connection on my bikes, but never thought to do the injectors.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

Redman4x4

Redman4x4
active member
active member
Thanks, I will check those both while I have it all disassembled.

    

duck

duck
Life time member
Life time member
Here's a PDF of the Frog's K100 troubleshooting page:

http://dws.x10host.com/11tech/K100.Troubleshoot.Start.2018.pdf


__________________________________________________
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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

Redman4x4

Redman4x4
active member
active member
That's awesome! Many thanks for this my friend!!!

    

Redman4x4

Redman4x4
active member
active member
Thanks for all the help everyone. I just wanted to get back on here and say that and what the problem was.

It definitely ended up being the hall effect sensor for sure. I bought a new one from a place in Denver Colorado called Euro Moto Electrics and it is running great again. I'm currently also rebuilding my old one with some sensors I bought on ebay for $21 each. Almost done with it.

I really appreciate you all helping me out with getting this thing back on the road. I would have posted earlier but it's been raining so much here and I really don't trust people in cars, let alone in the rain.

Take care,
David Cianciolo

    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
That's good news.  Hope you decide to hang around with the inmates once the bike is running well.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

Redman4x4

Redman4x4
active member
active member
Definitely, I love this brick and the folks here in this forum.

    

Dai

Dai
Life time member
Life time member
Greetings from Greenville South Carolina  177912


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'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

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