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K100-forum.com » Technical, repair and troubleshooting » Electrical » Speedo reading low, variable

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1Back to top Go down   Speedo reading low, variable Empty Speedo reading low, variable Mon Oct 03, 2016 9:22 pm

Rockman

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My speedo has started to read low. It seems to be about right when I first get going, but gradually drops off or is very slow to respond to speed changes. I am assuming dirty connections within the instrument unit, but am after any other suggestions. Its a second hand unit that I picked up a few months back and has been good until now. Everything else seems to work.

    

2Back to top Go down   Speedo reading low, variable Empty Re: Speedo reading low, variable Mon Oct 03, 2016 9:46 pm

Rick G

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Pull the sender out of the rear drive and check the face for iron dust accumulation. I have seen this play havoc with the speedos. It collects the tiny particles of iron from the wear of the gears and bearings.


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"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 1999 K1100 LT with a Big Block 1200
    

3Back to top Go down   Speedo reading low, variable Empty Re: Speedo reading low, variable Mon Oct 03, 2016 9:52 pm

92KK 84WW Olaf

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Mine does that too. But a little tap on the clock seems to sort it for now. In my case it seems the problem is the cable connector into the clocks.

It is a known problem though and there are threads on it.


__________________________________________________
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 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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   Speedo reading low, variable Empty Re: Speedo reading low, variable Mon Oct 03, 2016 9:53 pm

92KK 84WW Olaf

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And yes the rear wheel sensor check it first.


__________________________________________________
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 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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 reading low, variable Empty Re: Speedo reading low, variable Tue Oct 04, 2016 12:43 am

indian036

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This isn't actually a problem!

"But officer, my speedo said I was only doing xxxxkm/h."

lol!

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy ROB the Red Old Bike   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress
1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Tom the Triple (now on Historic rego too.)
    

6Back to top Go down   Speedo reading low, variable Empty Re: Speedo reading low, variable Tue Oct 04, 2016 1:45 am

Rockman

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indian036 wrote:This isn't actually a problem!

"But officer, my speedo said I was only doing xxxxkm/h."

lol!

Bill
Yes Bill, I'm sure I'd get away with that Laughing

The sensor is easy to check so I'll start there.

    

7Back to top Go down   Speedo reading low, variable Empty Re: Speedo reading low, variable Tue Oct 04, 2016 3:40 am

Holister

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Mine was doing that on the naked. Advice from the forum was to clean the sensor connector at the R/H side right where the tank connector is. Worked a treat.


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1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808		 Speedo reading low, variable Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

8Back to top Go down   Speedo reading low, variable Empty Re: Speedo reading low, variable Tue Oct 04, 2016 5:38 am

92KK 84WW Olaf

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You should be able to get at that connection without taking the tank off. Two wires go up there on the forward facing frame member, one for rear brake switch and one for the speedo sensor and both connections need a clean from time to time.


__________________________________________________
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 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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
    

9Back to top Go down   Speedo reading low, variable Empty Re: Speedo reading low, variable Tue Oct 04, 2016 6:34 pm

Rockman

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92KK 84WW Olaf wrote:You should be able to get at that connection without taking the tank off. Two wires go up there on the forward facing frame member, one for rear brake switch and one for the speedo sensor and both connections need a clean from time to time.
Yep, know where that is. I'll start with the sensor and work forward.

    

10Back to top Go down   Speedo reading low, variable Empty Re: Speedo reading low, variable Sun Nov 20, 2016 6:27 pm

Rockman

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I cleaned everything. Connectors, sensors etc. It is now ok up to about 110kmh but lags behind after that, but behaves normally when I slow down again to 110 or less. I'm putting it down to a dodgy sensor unless someone has a better suggestion.

    

11Back to top Go down   Speedo reading low, variable Empty Re: Speedo reading low, variable Mon Nov 21, 2016 3:21 am

charlie99

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last place to look is the instrument connectors ...they do get corroded on the pins sticking out of the instruments

I re-soldered mine with a definitive fix ..but sometimes the film connector inside may go partially open circuit

it isn't hard to solder in a parallel conductor pin to pin to bypass the flakey joints ...

don't forget that the odo - speedo  motor has separate pins to the film connector , which also become corroded on the contact points ...the whole assembly of the odo - speedo is easy to remove with just 2 screws ..once apart  then you can see the details of the pins and connectors

Speedo reading low, variable 2014-010


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

12Back to top Go down   Speedo reading low, variable Empty Re: Speedo reading low, variable Tue Nov 22, 2016 10:04 pm

Rockman

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Yes I probably need to dismantle the instruments and clean all the connectors. Its a used set I got off Gumtree(?) and I just bolted them on. Everything seemed to work then. I did notice some improvement when I cleaned the sender, for what thats worth.

    

13Back to top Go down   Speedo reading low, variable Empty Re: Speedo reading low, variable Tue Nov 22, 2016 10:57 pm

charlie99

charlie99
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VIP
mine does that occasionally mate , usually its the side cover connector ... and after rain

after filing it lightly for more positive contact , and crimping the socket part a little tighter , hasnt happened again for over 3000 k  and always stable now


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

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