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1Back to top Go down    K100RT resurrection try on Wed Dec 13, 2017 12:40 pm

George_Pap

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Hi community. This is George from Crete Island Greece.
This is also my '85 K100RT
Bike has about 100000 km on it and been stored for tha last 10 years.
Took it to my service guys, swapped the fuel pump (with an aftermarket one), all the fuel line parts replaced, cleaned the injectors, all fluids replaced, newbattery and the holly beast roared again.
I took just 15 km of ride though since the registration paperwork is not finished so its an illegal moving vehicle.
After getting the lady home i noticed the following:



a. The neutral indicator (green) is not functioning
b. Speedometer and Tachometer dead.
c. What is this hose? It should be free floating? (picture 2)



d.Any idea where this cable should be attached? (picture 3)
It was floating in the back of the instrument cluster




Really thank you in advance for any help!


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K100RT (Early 1985 -nonABS)
    

2Back to top Go down    Re: K100RT resurrection try on Wed Dec 13, 2017 6:57 pm

Dai

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Pic1: If the gear position indicator works (indicates zero) then the neutral light is probably blown.
Pic2: It's a battery overflow hose. Throw it away if you have a sealed battery fitted.
Pic3: One wire is green-black. What colour is the other? (green and what?). I'm wondering if it's for the windscreen motor drive.


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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)
    

3Back to top Go down    Re: K100RT resurrection try on Sat Dec 16, 2017 1:27 am

George_Pap

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@Dai wrote:Pic3: One wire is green-black. What colour is the other? (green and what?). I'm wondering if it's for the windscreen motor drive.

Thanks Dai
The other one is just green. My windshield though is not motor driven


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K100RT (Early 1985 -nonABS)
    

4Back to top Go down    Re: K100RT resurrection try on Sat Dec 16, 2017 1:39 am

charlie99

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check the fuses , could explain why the instruments aren't working ?

I would just insulate both those wires for the moment (and from each other ) till you can chase down where the wires come from ...perhaps something as an after market thing , now removed ?

good luck


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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
    

5Back to top Go down    Re: K100RT resurrection try on Sat Dec 16, 2017 6:26 pm

Dai

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I'm seriously tempted to say 'bodge job'. The green and green/black wires never come together in the same place. Does the bike start when it is not in neutral or does it always have to be in neutral? If it always has to be in neutral, put the bike on the mainstand, knock it into first gear and pinch the wires togther. Now try to start it. If it does try to fire up then someone's bodged the clutch switch. Those wires quite obviously have been soldered to something at one point which is not OEM.

Alternatively, can you trace where the other end of the wires go to?


__________________________________________________
'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)
    

6Back to top Go down    Re: K100RT resurrection try on Mon Dec 18, 2017 9:29 am

George_Pap

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@charlie99 wrote:check the fuses , could explain why the instruments aren't working ?

I would just insulate both those wires for the moment (and from each other ) till you can chase down where the wires come from ...perhaps something as an after market thing , now removed ?

good luck

Thanks Charlie.
I have checked all the fuses, everything intact. The only think that doesnt operate is the Neutral light and the Speedo. As for the speedo i think is a faulty pickup sensor.
No, i did not remove anything from the bike. I noticed these wires after removing the instrument panel so i m not sure if i detached it by mistake without noticing.


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K100RT (Early 1985 -nonABS)
    

7Back to top Go down    Re: K100RT resurrection try on Mon Dec 18, 2017 9:30 am

George_Pap

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@Dai wrote:I'm seriously tempted to say 'bodge job'. The green and green/black wires never come together in the same place. Does the bike start when it is not in neutral or does it always have to be in neutral? If it always has to be in neutral, put the bike on the mainstand, knock it into first gear and pinch the wires togther. Now try to start it. If it does try to fire up then someone's bodged the clutch switch. Those wires quite obviously have been soldered to something at one point which is not OEM.

Alternatively, can you trace where the other end of the wires go to?

Thanks Dai, i'll give this a try and come back with an update!


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K100RT (Early 1985 -nonABS)
    

8Back to top Go down    Re: K100RT resurrection try on Mon Dec 18, 2017 10:47 am

charlie99

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@George_Pap wrote:
@charlie99 wrote:check the fuses , could explain why the instruments aren't working ?

I would just insulate both those wires for the moment (and from each other ) till you can chase down where the wires come from ...perhaps something as an after market thing , now removed ?

good luck

Thanks Charlie.
I have checked all the fuses, everything intact. The only think that doesnt operate is the Neutral light and the Speedo. As for the speedo i think is a faulty pickup sensor.
No, i did not remove anything from the bike. I noticed these wires after removing the instrument panel so i m not sure if i detached it by mistake without noticing.

didn't mean that you may have removed some thing , perhaps a previous owner ?
possibly the sensor is a good place to look as they gather metal over the pickup area , a wipe - clean is often all that is required ...but under the right hand side cover is where a connection from the pickup sensor to main loom sits
these connections often corrode , and need a clean up , so try there also .

whilst in the same area you will find the gear position sensor connection to main loom (4 pin plug/ socket ) try cleaning there also

good luck


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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
    

9Back to top Go down    Re: K100RT resurrection try on Wed Dec 20, 2017 2:12 am

club_c

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My wiring diagram says green/black and green are for UK spec driving lights. Don't have any idea if that helps...


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"There's never enough time to do it right, but there's always time to do it over."

1988 K100RS SE VIN 01477554
    

10Back to top Go down    Re: K100RT resurrection try on Wed Dec 20, 2017 8:08 am

Dai

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Damn - you could be very right on that point. Anything post-'03 in Europe (not just the UK) has to have a permanent headlight on.


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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: K100RT resurrection try on Thu Dec 21, 2017 2:36 am

George_Pap

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Yup, it looks that it has to be the lights. Thanks guys Smile

Now lets jump to the next challenge. Gear indicator switch.
Display shows 4 when in neutral, no green light, etc etc.
Need to use clutch lever to fire it up.
So tried to clean the connector that was really full of white corrosionpowder, no luck though.
Checked, dissasembledthe instrument cluster too but everything seems in great shape inside. no corrosion everything clean and clear as new.
I guess i ll have to pull out the switch from the back of the gearbox prior check and lubrication.
Is there any chance to do it without dissasembling the swing arm etc?
Is removal something i can do with the bike on the center stand?

Thanks


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K100RT (Early 1985 -nonABS)
    

12Back to top Go down    Re: K100RT resurrection try on Thu Dec 21, 2017 3:09 am

charlie99

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yes you can park the bike on the centre stand and pull the swing arm

our old mate sidecar paul installed some resistors to help in the wiring to his gear position sensor ...what this does is hold some current through the switch , to keep the contact areas clean and also to force the logic to show the correct switch position on the lcd ...and obviously then the start circuit
which comes from inside the instruments gear switch decoder board


if you search the forum you may find the original post

good luck


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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
    

13Back to top Go down    Re: K100RT resurrection try on Thu Dec 21, 2017 5:40 am

indian036

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Sadly, it looks like the actual gear indicator switch is not working. Happily, it's usually an easy fix to dismantle, clean and re-seal. (Often the failure is due to the factory seal cracking up with age and letting in water and road crud.)
Sadly again, it's a pain to get out because it's on the back of the gearbox in the tight space in front of the swing arm. You wanted to dismantle that to grease the drive shaft splines anyway, didn't you?

Good luck,
Bill


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1985 K100RT VIN 0028991 My original Very Happy (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 Newest toy, slightly non-original
    

14Back to top Go down    Re: K100RT resurrection try on Thu Dec 21, 2017 8:26 pm

Inge K.

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@George_Pap wrote:Now lets jump to the next challenge. Gear indicator switch.
Display shows 4 when in neutral, no green light, etc etc.

On the GPI switch you have at the connector 3 signal wires and ground....
and the 3 signal wires is grounded in various config.
The signal wires is yellow with a tracer, ground wire is brown.

If it shows 4 in neutral it could be open circuit in the yellow/white signal wire.
Then the GPI gonna show:
1 - 5
N - 4
2 - blank
3 - blank
4 - 4
5 - 5


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

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