BMW K bikes (Bricks)

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1Back to top Go down    Problems with speedo on Tue Dec 05, 2017 11:38 am

Stumpy

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I was riding home and the speedo and odometer failed.
Does it have a fuse or is it smoothing else that is simple?

    

2Back to top Go down    Re: Problems with speedo on Tue Dec 05, 2017 11:54 am

kioolt

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It could be something as simple as the connector from the speed sensor which is located near the rear drive. Follow the cable from the speed sensor up to the connector. Try unplugging it and then plug it back to see if that fixes your problem. It's work for me before. Especially after a rain.


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2004 R1150RT 183,000 miles
1991 K100LT 128,700 miles
1982 R100RT 106,900 miles
Total418,600 BMW miles

AMA,BMWRA,BMWMOA


The cheapest thing on a BMW is the nut that connects the handlebars to the seat.
    

3Back to top Go down    Re: Problems with speedo on Tue Dec 05, 2017 4:00 pm

MartinW

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The sensor where I goes into the final drive can also get dirty. It needs to be removed and cleaned. Bricks are known for electrical bugs which can be cured easily by going over all the connectors with Deoxit.
Regards Martin.

    

4Back to top Go down    Re: Problems with speedo on Tue Dec 05, 2017 5:57 pm

Davep

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Has anyone tried the WD40 contact cleaner? Deoxit is about 5 times the price as the WD here in the UK so just wondered as WD40 products are normally pretty reliable.


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BMW K100RS 1983 (Main ride)
Suzuki GSX 750 ET 1979 (Needs work)
Kawasaki Zephyr 750 1992 (Needs hiding)
    

5Back to top Go down    Re: Problems with speedo on Tue Dec 05, 2017 7:15 pm

blaKey

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The WD40 Contact Cleaner, cleans away the dirt, grime or whatever, leaving a surface that is not protected.


The DeoxIT (note the correct spelling Very Happy ) cleans and covers the surface with a protective barrier and it enhances electrical conductivity. Top stuff and worth the money in my humble opinion.



Last edited by blaKey on Tue Dec 05, 2017 7:17 pm; edited 1 time in total (Reason for editing : Can't think of any particular reason. I'll get back to you if I remember what it was.)


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Neil
K100RS 1986 RED!
K100RT 1987 (now nekkid with red bits)

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6Back to top Go down    Re: Problems with speedo on Wed Dec 06, 2017 3:37 am

Davep

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Cheers BlaKey, I'll have to ask Santa if I've been a good boy this year and add it to my Christmas list, although I may also need to ask for a dictionary as my spelling has never been good! Laughing


__________________________________________________
BMW K100RS 1983 (Main ride)
Suzuki GSX 750 ET 1979 (Needs work)
Kawasaki Zephyr 750 1992 (Needs hiding)
    

7Back to top Go down    Re: Problems with speedo on Wed Dec 06, 2017 1:28 pm

Born Again Eccentric

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@Stumpy wrote:I was riding home and the speedo and odometer failed.
Does it have a fuse or is it smoothing else that is simple?
A sudden failure (rather than failing after a period of being erratic) is likely to be the fuse. I lost all instrumentation while riding (a while back) and I seem to recall that it was the tail light bulb blowing which took out fuse no.1.

Use a test meter to electrically test all your fuses - they do get tired and can fail without any overload reason. Who knows, you may still have original fuses fitted!


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Paul

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurancewrite-off rebuild Feb 17
"Donor" K100LT 1990 (Red) (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike). June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

8Back to top Go down    Re: Problems with speedo on Wed Dec 06, 2017 7:12 pm

robmack

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Instrument cluster power comes from fuse #1. If that fuse blew, it would also disable power to front and rear brake switches, clutch switch, heated grips, and additional instruments. You'd probably notice a lot more than lack of speedo and odometer. You'd not be able to start the bike, you'd have no brake lights and instrument lights would be gone as well. Since you haven't mentioned these symptoms, have to assume fuse #1 is intact.

Most likely it is the connection to the speed sensor in the rear drive. Either the connector under the right battery cover is corroded, or the 24-pin cluster connector is corroded. Disassemble, clean and re-seat several times to ensure contact is good. It's unlikely to be a bad speed sensor, but you could also remove and clean it as well.

Download K-diag and test your speedometer if these instructions fail. K-diag is available in the download section. Usage instructions here.


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Robert
1987 K75 @k75retro.blogspot.ca
2011 Moto Guzzi V7 Racer
http://k75retro.blogspot.ca/
    

9Back to top Go down    Cleaned sensor on Wed Dec 06, 2017 9:18 pm

Stumpy

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I took the sensor out and wiped it clean, I then checked the connector for corrosion.
When I put the bike in gear the speedo started to move up and register.
Hopefully this is fixed, I have looked at the wiring and it looks knackered, I may see if I can get a new loom made.

    

10Back to top Go down    Re: Problems with speedo on Thu Dec 07, 2017 3:54 pm

Dai

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Post 9 here:

http://www.k100-forum.com/t10428-comberjohn-s-ghost

It might make your life a bit easier if making a new loom.


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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)
    

11Back to top Go down    Re: Problems with speedo on Thu Dec 07, 2017 9:59 pm

Stumpy

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@Dai wrote:Post 9 here:

http://www.k100-forum.com/t10428-comberjohn-s-ghost

It might make your life a bit easier if making a new loom.
Thanks for that, It is just what I need.

    

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