BMW K bikes (Bricks)

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Dai

Dai
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Life time member
I'm building a new wiring loom for LFB and just did something really, really stupid - I punched the four pins out of the fuel tank connector without noting where they went. 'Ah - not a problem' thinks I 'the terminals must be marked somewhere'. After ten minutes of closely inspecting two round connectors and two fuel senders, 'are they bollocks marked somewhere' thinks I. Can someone help with a photograph / colours with reference to the locator cutout? The wires are brown, brown/red, green/white and brown/yellow.

MTIA Embarassed Wire colours for the 4-pin fuel tank connector ('83 K100) 652573


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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)
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Looking at the rear of the tank connector where the wires enter with the rounded edge uppermost, the brown is upper right, going clockwise from there, is white at lower right, yellow at lower left, and green at upper left.

hope this helps.


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Present:
1994 K75RT
1991 K100RS

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
    

duck

duck
Life time member
Life time member


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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
    

volador

volador
Silver member
Silver member
What is LFB?



Last edited by volador on Thu Jun 13, 2019 6:52 pm; edited 1 time in total


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1984 K100RS  1991 K100RS
    

tinyspuds

tinyspuds
Silver member
Silver member
Not sure if this helps Dai, UK spec ‘85 RT. Curve uppermost, the top right is Green/White but the other 3 are solid colours. Good luck.
Wire colours for the 4-pin fuel tank connector ('83 K100) Img_2011


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1985 BMW K100RT + Hedingham HUB and LL’s.
2007 HD883 Sportster. Bobbed and bettered.
1954 Royal Enfield 350 Bullet. Original.
    

Dai

Dai
Life time member
Life time member
@volador wrote:What is LFB?
Low Flying Brick - my K100 Very Happy


Sorry guys - so far all those pics are post '85. It's the connector that plugs in forward-left of the fuel tank.


Duck: the problem with the wiring diagram is that it gives you the terminal designations, but there's no corresponding markings on either the round connector or the screw-in bit on the fuel tank.


__________________________________________________
'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)
    

chris846

chris846
Life time member
Life time member
I'll be able to photgraph my '84 K100 this afternoon if that helps?


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The Longest Lunch
    

Dai

Dai
Life time member
Life time member
You bet it will! Very Happy Please show the locating cutout Chris, because that will nail the positions of the wires.


__________________________________________________
'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)
    

chris846

chris846
Life time member
Life time member
In the shed at the mo, cannot add pics on my phone. Looking at the rear of the plug, with the notch at 12 o’clock:
Bottom left is brown with black
Bottom right is brown with white
Top right is brown
Top left is - green with white

The last one has been repaired by me some time ago- is the colour correct?

Edit: second inspection shows the bottom right wire is brown with white. The colours now all accord with Haynes diagram for early k100s, with the exception of my repaired wire - which should be green with black according to Haynes. I probs didn’t have any when I repaired it! Does this fit with what you’ve got Dai?

Edit2: the Haynes colour is green with white! Don’t trust a dyslexic would be electrician. Especially a colour blind one too. So everything is correct on my bike/the above list.

Edit3(going for the record): Here's a pic, not working with much eh? Trust me, the bottom left wire is brown with black, bottom right is brown with (yellowing) white, top right is brown and top left, having detached itself from the connector and absented itself from this pic, is green with dirty white. The yellow wire is my previous repair. Looks like I've got some work to do. Do you/can you replace the terminals after you've removed them from the plug? if so, with what?

Wire colours for the 4-pin fuel tank connector ('83 K100) Img_2310


__________________________________________________
The Longest Lunch
    

Dai

Dai
Life time member
Life time member
That sounds like it Chris. Dunno why I used a brown/red wire but it's easy enough to replace with a brown/black anyway. Brown/yellow can be excused as a faded brown/white.

As for pins: you can get the original ones from Farnell (or 'Silicon14' as the trade name is) but I also discovered that with a bit of abuse you can get Molex 93-thou series pins to fit. They're easier to get as quite a few resellers now have them at exorbitant unit prices as part of a plug'n'socket kit e.g.

https://www.gutsibits.co.uk/pr/TheShop/index.php?f=d&q=ELA17738

Looks like they've cut the photographic model from a belt feed as they don't normally have 'wings' on. Anyway, PM me and I'll send you half-a-dozen. I buy them in bulk because they're OEM for almost all older Japanese wiring looms. Unfortunately in recent years there's been a distressing tendency for Kawayamahonzuki to switch over to a combination of bloody expensive waterproof Tyco/Amp connectors mixed with somewhat cheaper 2.4mm flat terminals in non-wet areas.


__________________________________________________
'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)
    

chris846

chris846
Life time member
Life time member
Cheers Dai, useful info. I've got some molex pins & sockets, and as for mechanical abuse to make them fit, well you know I've got plenty of that too.
Very Happy


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The Longest Lunch
    

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