BMW K bikes (Bricks)


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1Back to top Go down   Applying brake turns my K100 off Empty Applying brake turns my K100 off Mon Apr 24, 2023 12:22 pm

OrdinaryRider

OrdinaryRider
New member
New member
Hello and greetings from Finland!

I have a 1990 K100RS. Has been working well already for 192k. But now battery had died during warm winter storage (no surprise). Replaced the battery with a new one. Bike started right up and ran for 20 seconds or so and then died. After this I tried to start it several times, cranks well but won't start anymore. Doesn't even try. Went through the basic stuff like ground connections and fuses, all seem fine. I can also hear the fuel pump. 

Then I noticed that when the ignition is on, and if I apply brake (front or rear), the bike dies (all lights incl. instrument cluster), just like switching ignition off. When releasing the brake, everything comes back on, like turning the key.

Tried searching for similar issue but didn't find. Has anyone here encountered similar? Would be grateful for all advice. Can this prevent the starting?

Thanks to all for help!

    

2Back to top Go down   Applying brake turns my K100 off Empty Re: Applying brake turns my K100 off Mon Apr 24, 2023 1:21 pm

firstle

firstle
Life time member
Life time member
flat battery maybe

    

3Back to top Go down   Applying brake turns my K100 off Empty Re: Applying brake turns my K100 off Wed Apr 26, 2023 1:54 pm

charlie99

charlie99
VIP
VIP
Sounds like fuse 1 is corroded....... or ignition swith needs a good clean

Experienced the same issue just recently on " Red"     cleaning ignition switch was the fix 

Quite a few posts on this proceedure in the forum

Good luck


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

4Back to top Go down   Applying brake turns my K100 off Empty Re: Applying brake turns my K100 off Wed Apr 26, 2023 2:41 pm

duck

duck
Life time member
Life time member
is it a 2 valve or 4 valve K100RS?


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

5Back to top Go down   Applying brake turns my K100 off Empty Brake problem Wed Apr 26, 2023 6:18 pm

daveyson

daveyson
Life time member
Life time member
When you turn the key on, you should hear a faint click from the relay box, that's the load shed relay closing as it gets power from the ignition switch to pin 86. If it loses power when the brakes are applied, clean the ignition switch. If it doesn't lose power, the problem could be at fuse one or the kill switch. A test for this would be a temporary jumper wire to bypass the kill switch. Or if there's power going into the kill switch, but no power coming out, with the button pressed (which supplies fuse one) it's the kill switch. In other words, is fuse one supplied with power when the ignition is on, and also when the start button is pressed?

Give the fuse holders a spray with electrical contact cleaner, and replace the fuses with new ones, even if they have continuity. Check that they are tight, and that the  wires have full, clean contact to the relay holder. The fuses are deliberately the weakest link, and deliberately the easiest thing to do.


__________________________________________________
11/1985 bmw k100rt (late model)  Vin. 0090567
 ~120,000 km
    

6Back to top Go down   Applying brake turns my K100 off Empty Re: Applying brake turns my K100 off Thu Apr 27, 2023 4:46 am

92KK 84WW Olaf

avatar
Life time member
Life time member
It will help if you tell us if it is 2v or 4 v. For 1990 it could be either and they are different.

Has it ABS?


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

7Back to top Go down   Applying brake turns my K100 off Empty Re: Applying brake turns my K100 off Sat Apr 29, 2023 3:45 am

OrdinaryRider

OrdinaryRider
New member
New member
Thanks for all the suggestions!

It is a 4V without ABS. Seems I could start by checking the ignition switch based on your replies. I am also planning to check the light bulb monitor.

Will post an update once I have had the chance to try these!

    

8Back to top Go down   Applying brake turns my K100 off Empty Re: Applying brake turns my K100 off Tue May 09, 2023 8:04 am

recomu

recomu
active member
active member
Cavaliere ordinario wrote:Grazie per tutti i suggerimenti!

È un 4V senza ABS. Sembra che potrei iniziare controllando l'interruttore di accensione in base alle tue risposte. Sto anche pensando di controllare il monitor della lampadina.

Pubblicherò un aggiornamento una volta che avrò avuto la possibilità di provarli!

Ho la stessa moto tua, ho avuto lo stesso problema lo scorso anno e l'ho risolto con la sostituzione del blocchetto di accensione posto sotto alla chiave di avviamento.
Un saluto.

    

9Back to top Go down   Applying brake turns my K100 off Empty Re: Applying brake turns my K100 off Tue May 09, 2023 4:19 pm

Arlina

Arlina
Moderator
Moderator
Cannot remember if Finnish people speak or read Italian.....

The 4V bikes have a switch on the centerstand, wich sometimes cause trouble.
Unplug it (connector in right triangle) and "shortcircuit" it, bike should start.


__________________________________________________
Applying brake turns my K100 off Eu-log10  K1100RS/LT - R1200RT - R1100RS - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S - K1100RS - K75RT - K75C
    

10Back to top Go down   Applying brake turns my K100 off Empty Re: Applying brake turns my K100 off Wed May 10, 2023 6:22 am

recomu

recomu
active member
active member
Arlina wrote:Cannot remember if Finnish people speak or read Italian.....

The 4V bikes have a switch on the centerstand, wich sometimes cause trouble.
Unplug it (connector in right triangle) and "shortcircuit" it, bike should start.

... but what are translators for!!

    

11Back to top Go down   Applying brake turns my K100 off Empty Re: Applying brake turns my K100 off Wed May 10, 2023 11:50 am

Laitch

Laitch
Life time member
Life time member
Mon aéroglisseur est plein d'anguilles. Smile

    

12Back to top Go down   Applying brake turns my K100 off Empty Re: Applying brake turns my K100 off Wed May 10, 2023 11:57 am

duck

duck
Life time member
Life time member
Laitch wrote:Mon aéroglisseur est plein d'anguilles. Smile

cheers cheers cheers


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

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