BMW K bikes (Bricks)

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George_Pap

George_Pap
Silver member
Silver member
Hey all. I'm thinking getting Mgadget's Pro instrument and i m a bit confused with the Neutral Light indicator.
My original GPI never got to show the neutral green light and number 0 on my lunch box. I ordered another used one GPI from motoworks but the same problem. 
The only way to see the green light on is to make contact with a certain combination of the four cables, so its not a lunchbox issue for sure.
So to the point./
1. Does the Motogadget Pro needs the original GPI to display the Neutral light or not? ( i know some Acewells dont need the GPI installed )
2. Is servicing the GPI unit doable or i should get a new one to be sure? Its not a cheap part. 

Thank you gentlemen.


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K100RT (Early 1985 -nonABS)
    

Dai

Dai
Life time member
Life time member
I can't answer (1) but (2) is a problem with the GPI switch on the back of the gearbox. Yes, it is servicable (most of the time) - search 'gpi switch' on the forum for many threads on the subject.


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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)
    

George_Pap

George_Pap
Silver member
Silver member
Thank you dear Dai, hope you re doing fine Smile


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K100RT (Early 1985 -nonABS)
    

duck

duck
Life time member
Life time member
It is easy to test the GPI circuit to see if the problem is the switch on the transmission or the circuit board in the cluster.  The LCD, green N lamp and power to the start button are a replaceable subassembly within the cluster.

Neutral Light for 1985 k100 and Motogadget pro Gpi.pcb

Find the GPI switch connector under the right side battery cover and unplug it.

It has four wires:
Brown
Yellow/Black
Yellow/Blue
Yellow/White

Switch connector: When the transmission is in neutral all three of the yellow/other color wires should have continuity with the brown ground wire.

Other connector: If you ground all three of the yellow/other color wires then the LCD in the cluster should read 0 and the green light should come on.


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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
    

George_Pap

George_Pap
Silver member
Silver member

It has four wires:
Brown
Yellow/Black
Yellow/Blue
Yellow/White

Switch connector: When the transmission is in neutral all three of the yellow/other color wires should have continuity with the brown ground wire.

Other connector: If you ground all three of the yellow/other color wires then the LCD in the cluster should read 0 and the green light should come on.

Thats exactly what i did. 
using that method i managed to get the green light to come on on the cluster and also the -0- number to display on the small lcd screen. 
So i guess i have a faulty GPI unit. What makes me suspicious is the fact thats the second ( used though but like new outside ) sensor i get and not working.  
Probably before getting a brand new one i 'll try dismantling this one to check the inner.


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K100RT (Early 1985 -nonABS)
    

chris846

chris846
Life time member
Life time member
The Ks don't have too long a list of known faults/weaknesses, but the gear position switch is definitely on it. Doesn't surprise me that you got a duff replacement.


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The Longest Lunch
    

George_Pap

George_Pap
Silver member
Silver member
@chris846 wrote:The Ks don't have too long a list of known faults/weaknesses, but the gear position switch is definitely on it. Doesn't surprise me that you got a duff replacement.

Looks like it !
Thanks Chris.


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K100RT (Early 1985 -nonABS)
    

GF Wollongong

GF Wollongong
Gold member
Gold member
My bike has a faulty gear sensor...least of my worries.

I just placate myself with accepting it as another endearing idiosyncrasy. Added to ... no speedo, ropey tacho, slow leak at back of gear box, an occasional knock up front I can't find (next: pull the forks and dismantle) 

The gears work fine obviously but I do get the occasional neutral in between 4th and 5th

Just as well annual historic bike inspection is carried out by Stevie Wonder.

GF

    

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