BMW K bikes (Bricks)

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1Back to top Go down    Welding on a K bike on Tue Aug 21, 2018 7:50 pm

MarcS

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I have installed a Spacerack/Gearsack rack to my K and need to tack the brackets to the rack while on the bike to get the exact position. Do I need to disconnect the battery or ECU so I don't fry anything? If I were a better fabricator i would be able to get the angles and measurements right with the frame on a bench but alas.............


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K100rt ex plod bike 5/1990.



I have no problem with authority. Just some of the morons that are paid to enforce it.
    

2Back to top Go down    Welding on a K bike on Wed Aug 22, 2018 3:14 am

Tom FKR

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Hi Marc, yes, the battery should be disconnected. I would also unplug the FICU just to be sure. Some more learned friends may add to these comments. Cheers Tom Perhaps the ICU should also be unplugged.


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1993 K75 Slightly Modified
2010 BMW F650GS Twin
1992 R100R
    

3Back to top Go down    Re: Welding on a K bike on Wed Aug 22, 2018 3:21 am

RicK G

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Yep just what Tom said


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

4Back to top Go down    Re: Welding on a K bike on Wed Aug 22, 2018 6:43 am

Dai

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My normal modus operandi when stick welding on any bike is that if it's electronic and it can be unplugged, unplug it. On the K that would be the ICU, FICU, battery and the alternator plug.


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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)
    

5Back to top Go down    Re: Welding on a K bike on Wed Aug 22, 2018 9:05 am

Gaz

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Use the oxy set


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Gaz
95 K1100LT 0232224; 90 K75 6427509; 87 R80G/S PD 6292136
    

6Back to top Go down    Re: Welding on a K bike on Wed Aug 22, 2018 1:16 pm

Two Wheels Better

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A mate of mine welded the cracked centre stand on his K100RT whilst it was still attached to the machine. Good thing our local dealer friend had a used $300 ECU (they were $600 new back in those daze) as it was the first thing to go up in smoke. After spending the extra dosh he was off and running again. Lesson learnt.


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1987 K100RS, '93 Framed K11/K12 engine 'Big Block', '09 K1300GT, '07 K1200R, '04 R1150RT, '95 R100 Mystic, '77 R75/7.
Sniff...can you smell that? I think it might be bullsh*t.

    

7Back to top Go down    Re: Welding on a K bike on Wed Aug 22, 2018 3:19 pm

Dai

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@Gaz wrote:Use the oxy set
Um. A stick welder will do less damage to the surrounding paintwork, but that would be the ideal solution.


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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)
    

8Back to top Go down    Re: Welding on a K bike on Wed Aug 22, 2018 8:03 pm

MarcS

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Thanks guys. I unplugged everything and tacked it with the mig. Then removed the rack and welded it up properly.


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K100rt ex plod bike 5/1990.



I have no problem with authority. Just some of the morons that are paid to enforce it.
    

9Back to top Go down    Re: Welding on a K bike on Wed Aug 29, 2018 6:08 pm

pprince

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Agreed, when welding on anything with electric you always disconnect the battery(s).


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Paul
1984 Honda V65 Magna
1985 BMW K100RT
2011 BMW K1600GTL (gone)
2018 BMW K1600GTL
    

10Back to top Go down    Frame Welding on Thu Aug 30, 2018 11:28 pm

redrockmania

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Dai's advice is correct on disconnecting battery and electrical components - especially ECU and EFI computers. The other thing well worth doing is to adequately shield around the weld area so as not to cause damage to metal. paint, plastic, rubber and wiring. Weld spatter can cause damage to these items. Have a portable fire extinguisher on hand also - just in case.

    

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