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1Back to top Go down   Bouncing speedo needle at idle Empty Bouncing speedo needle at idle Tue Feb 20, 2024 4:05 am

KiwiK100

KiwiK100
Gold member
Gold member
Hey everyone, I’m in the final stages of my ‘83 K100 restoration and finally fuelled her up and got her running. Problem. I noticed the speedo needle was occasionally flickering or bouncing, sometimes as high as 40 or 50 kph while at idle and in neutral. I popped her into gear and there was no speed registering on the gauge. Nadda. I removed the sensor and did the soldering iron test, and it was perfect, showing around 60kph as expected. The pick up is spotless and the FD oil is fresh. Any ideas where to go next? 
Thanks in advance


__________________________________________________
Current rides:
2020 R1250RS. Metallic black with all the fruit
1983 K100C. Red. Krauzer fairing.
1984 K100RS. Madison silver.
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID. 186,000km SOLD Crying or Very sad
1991 K1. Schwartz metallic black, 18 month frame off restoration. 74,000km SOLD Crying or Very sad
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD Crying or Very sad
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Grandads ride
    

2Back to top Go down   Bouncing speedo needle at idle Empty Re: Bouncing speedo needle at idle Tue Feb 20, 2024 7:45 am

charlie99

charlie99
VIP
VIP
i also have a bike that does that ....

not sure of the fix just yet but it could be the power supply line to the meter movement being slightly dry joint 

im thinking on the backing ribon circuit between the input pins on the lunchbox connector and the actual speedo amplifier , then onto the motor .
on gerty i had duplicated the wiring with solid cables soldered to the connectors going to the pins to the electronic boards .
 which solved several issues including the meters dropping out occasionally ...requiring the bump the instruments fix ...till the next big pothole .
remember ... support the loom cable before it gets to the instruments connector .so that it doesnt pull on the pins in the lunchbox .as it hangs , wearing out the plating coating of the pins 


hope that helps 

Bouncing speedo needle at idle 2014-014



Last edited by charlie99 on Tue Feb 20, 2024 7:57 am; edited 1 time in total


__________________________________________________
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 )
    

3Back to top Go down   Bouncing speedo needle at idle Empty Re: Bouncing speedo needle at idle Tue Feb 20, 2024 7:53 am

Dai

Dai
Life time member
Life time member
I had an instrument panel where both the tacho and the speedo did that. Turned out to be the coil springs that return the needle to zero were displaced - a quick ping with a small screwdriver fixed that.


__________________________________________________
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
    

4Back to top Go down   Bouncing speedo needle at idle Empty Re: Bouncing speedo needle at idle Tue Feb 20, 2024 3:57 pm

KiwiK100

KiwiK100
Gold member
Gold member
Thanks for the replies lads. I do have a spare instrument cluster, so wondering if I should rape it for parts. Maybe I’ll just swap it over to see if that fixes the problem. Only issue is that I want to maintain the odo reading on the original cluster as the mileage is verified


__________________________________________________
Current rides:
2020 R1250RS. Metallic black with all the fruit
1983 K100C. Red. Krauzer fairing.
1984 K100RS. Madison silver.
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID. 186,000km SOLD Crying or Very sad
1991 K1. Schwartz metallic black, 18 month frame off restoration. 74,000km SOLD Crying or Very sad
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD Crying or Very sad
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Grandads ride
    

5Back to top Go down   Bouncing speedo needle at idle Empty Re: Bouncing speedo needle at idle Tue Feb 20, 2024 4:04 pm

Dai

Dai
Life time member
Life time member
KiwiK100 wrote: Only issue is that I want to maintain the odo reading on the original cluster as the mileage is verified
Easy done. The very early versions of the instrument cluster actually dismantle completely, so it's easy to set the numbers where you want them. The later ones don't, but a thin jeweller's screwdriver inserted between the drums disenages the ratchet and enables you to rotate the drum. By 'the later ones' I'm still referring to the '83-'85 K100s that have the dual fuel level indicators on them, but it also applies to the '85-onwards single fuel indicator versions.


__________________________________________________
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
    

6Back to top Go down   Bouncing speedo needle at idle Empty Re: Bouncing speedo needle at idle Tue Feb 20, 2024 4:36 pm

KiwiK100

KiwiK100
Gold member
Gold member
Thanks Dai, not sure about the integrity of the rest of the cluster however I’ll hook it up if only to see if the speedo works, and what other bits do or don’t. Know the GPI screen is toast. Both clusters have the dual fuel level indicators, so that’s a good start


__________________________________________________
Current rides:
2020 R1250RS. Metallic black with all the fruit
1983 K100C. Red. Krauzer fairing.
1984 K100RS. Madison silver.
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID. 186,000km SOLD Crying or Very sad
1991 K1. Schwartz metallic black, 18 month frame off restoration. 74,000km SOLD Crying or Very sad
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD Crying or Very sad
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Grandads ride
    

7Back to top Go down   Bouncing speedo needle at idle Empty Re: Bouncing speedo needle at idle Thu Feb 22, 2024 11:39 pm

KiwiK100

KiwiK100
Gold member
Gold member
I’ve swapped the instrument cluster for my spare unit and the speedo works fine, so where do I start… I took the back off, and the the screen, and when I went to carefully prise the needle off, it literally fell off. Squeezed it back on, put it all back together and presto, all working now. That’s a lucky break! 
Thanks to Dai and Charlie for your input.


__________________________________________________
Current rides:
2020 R1250RS. Metallic black with all the fruit
1983 K100C. Red. Krauzer fairing.
1984 K100RS. Madison silver.
2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID. 186,000km SOLD Crying or Very sad
1991 K1. Schwartz metallic black, 18 month frame off restoration. 74,000km SOLD Crying or Very sad
1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD Crying or Very sad
The family history:
1951 AJS 500 single - my Dads ride
1953 Triumph Terrier - my Mum's ride
1916 Triumph Type H, Battle of the Somme, France WW1 - my Grandads ride
    

8Back to top Go down   Bouncing speedo needle at idle Empty Re: Bouncing speedo needle at idle Fri Feb 23, 2024 5:19 am

Dai

Dai
Life time member
Life time member
Ah! Good catch! (Literally, I guess! Very Happy )


__________________________________________________
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
    

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