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1Back to top Go down   Speedo not working correctly Empty Speedo not working correctly Mon Sep 21, 2020 10:17 am

Middleton

Middleton
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Sorry if this is a repeat but I would like some advice, my speedo won’t go past 40mph, my indicators work but do not auto turn off, I have removed the speedo sensor and placed a soldering iron close to the sensor with the ignition on but get no reading at all on the speedo, I have cleaned the connector at the end of the sensor under the side panel but still no luck, not sure what is the next step but any help welcome.

    

2Back to top Go down   Speedo not working correctly Empty Re: Speedo not working correctly Mon Sep 21, 2020 10:25 am

Laitch

Laitch
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Here's some troubleshooting guidance that may help. Scroll down to the Fix a flaky speedometer link.


__________________________________________________
1995 K75 81,000 miles
Speedo not working correctly Usa-lo10
    

3Back to top Go down   Speedo not working correctly Empty Re: Speedo not working correctly Mon Sep 21, 2020 10:38 am

Middleton

Middleton
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Thank you - that will be very useful

    

4Back to top Go down   Speedo not working correctly Empty Re: Speedo not working correctly Mon Sep 21, 2020 11:18 am

92KK 84WW Olaf

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Life time member
Life time member
Auto turn off needs the speedo doing its thing, if its off then no auto turn off.


__________________________________________________
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 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 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
    

5Back to top Go down   Speedo not working correctly Empty Re: Speedo not working correctly Mon Sep 21, 2020 11:29 am

Middleton

Middleton
active member
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If my speedo is registering up to 40mph would that mean the sensor is working and it is something further upstream or could it still be the sensor,

    

6Back to top Go down   Speedo not working correctly Empty Re: Speedo not working correctly Mon Sep 21, 2020 11:38 am

92KK 84WW Olaf

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Life time member
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It could also mean the sensor needs cleaning or the plug connector needs cleaning.....its near back of tank under right hand side panel, you can trace the cable up from the sensor.


__________________________________________________
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 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 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
    

7Back to top Go down   Speedo not working correctly Empty Re: Speedo not working correctly Mon Sep 21, 2020 11:53 am

Middleton

Middleton
active member
active member
Hi, thank you for your help, I removed the sensor and cleaned it, and followed the sensor wire up to the connector under the side panel and cleaned that but then got stuck on next step,
If the sensor was faulty could I still get a speedo reading up to 40 mph or if it is the sensor would I get nothing at the speedo. Is there any more hidden connections before I dive into the speedo itself.

    

8Back to top Go down   Speedo not working correctly Empty Re: Speedo not working correctly Mon Sep 21, 2020 12:38 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
The plastic label on the speedo can wrinkle and lift up to where it stops the motion of the pointer.  This can be the result of long term parking outdoors in a sunny location.


__________________________________________________
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
    

9Back to top Go down   Speedo not working correctly Empty Re: Speedo not working correctly Mon Sep 21, 2020 1:40 pm

Middleton

Middleton
active member
active member
I will take a look at that tomorrow - Thank You

    

10Back to top Go down   Speedo not working correctly Empty Speedo Mon Sep 21, 2020 4:22 pm

daveyson

daveyson
Life time member
Life time member
If you unplug the wire from the flasher unit to the instrument cluster, the speedo might then work normally, but you would then lose the auto cancel feature. For some unknown reason I always turn it off manually, but only on a bike. Or cover the flasher units pin with a piece of paper to prevent the signal, or the instrument cluster pin. Maybe something wrong with that wire, or flasher unit. If you're reading 40mph maybe it takes twice as long as normal to auto cancel. The speedo sensor must be working (but maybe not correctly) or the speedo would read 0 kmh.

I had a problem like yours (but I never thought to take notice of the auto cancel feature) which was fixed by cleaning the contacts for the three pins inside the cluster and giving the pins a slight twist, for a tighter contact. You will see the ones I mean if you open the cluster. In my case the speedo would sometimes correctly read 60 mph,  and sometimes drop to 0 mph



Last edited by daveyson on Mon Sep 21, 2020 7:11 pm; edited 2 times in total


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

11Back to top Go down   Speedo not working correctly Empty Re: Speedo not working correctly Mon Sep 21, 2020 4:58 pm

Middleton

Middleton
active member
active member
Thank you, I will try that tomorrow, I am new to bike repairs so this is a new learning curve, is the flasher unit located under the tank ?

    

12Back to top Go down   Speedo not working correctly Empty Speedo Mon Sep 21, 2020 5:03 pm

daveyson

daveyson
Life time member
Life time member
Yep, it's green (usually) and rectangular, at the back of the relay box. You're looking for the blue/green wire,  pin 1.


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

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