BMW K bikes (Bricks)

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half brick

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Earth cables - where should I have them? K100 LT '89

None were fitted when I got it as a stripped down project.

The only earth cable on my bike goes from the battery to the frame earth under the tank where the loom earths.

Should there be a cable from battery to engine? Gearbox? Should the ECU casing be earthed?

Currently have an issue with the cooling fan and temp warning light coming on when bike is cold.

Thanks


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K100 LT 1989
    

2Back to top Go down    earth cables-where should I have them on Wed May 11, 2016 6:41 pm

Tom FKR

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On my 93 75, I did the following modification as far as earth cables go:- I disconnected the under tank earth wire cluster- about 5 wires. Then bolted a bar with 6 threaded holes onto the frame where the 5 earth wires were connected. Then ran a cable from the bar to the neg.side if battery and connected the 5 earth wires to the bar. Also ran another cable from battery to one of the retaining bolts for the starter motor. Also made sure earth cable connection on transmission is clean and tight. Sorry for long winded reply but this has solved some earth/ground problems. Cheers Tom


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1993 K75 Slightly Modified
2010 BMW F650GS Twin
1992 R100R
    

Holister

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+1 that...


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1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

half brick

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Thanks, I've now fitted an earth to gearbox, and will do one to starter. Already got one to under tank point.


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K100 LT 1989
    

AL-58

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You'll sometimes see a small lead running from one of the master cylinder cap screws down to the frame. My TT didn't and earthed through the throttle cable ruining the throttle cable at the same time.


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'87 K100RS/HRD sidecar (1100 motor)sc25
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

    

RicK G

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The ECU casing does not need to be earthed and I believe it should not be earthed.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

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