BMW K bikes (Bricks)

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ReneZ

ReneZ
Life time member
Life time member
Hi Team, just wondering if one of you has seen this before (I haven't). I was looking at a bike to buy (YES!! '85 K100) and as soon as the contact is switched on the speedo goes to full scale without the bike running. I wonder if the problem would be in the speedo or in the loom. Any thoughts/experience? Thanks!


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Greetings from Florida! Having a 'new' K  :cyclops:    Surprised-o: 

Rene


BMW K100 - 1985 (0030029) Extremely fast bike - speedo electrical issue Rain
BMW K1200GT - 2003 (ZK01223)
    

Inge K.

Inge K.
VIP
VIP
Congrats with a "new" bike!

Remember similar issues from other forums.......then it have been a ground problem......don't remember if it was at the multiconnector or inside the instrument.


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

92KK 84WW Olaf

avatar
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If its the yellow K either RT or LT 4,000rpm will give you 100kmh or 60mph and you can do the math from that.......


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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 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 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
    

ReneZ

ReneZ
Life time member
Life time member
Thanks both. Re last, the bike isn't moving whilst showing full scale :-) So it isn't a problem of the adjustment. Thing is if it is the speedo I'm OK with that. Having to chase a fault in the loom is something else..


__________________________________________________
Greetings from Florida! Having a 'new' K  :cyclops:    Surprised-o: 

Rene


BMW K100 - 1985 (0030029) Extremely fast bike - speedo electrical issue Rain
BMW K1200GT - 2003 (ZK01223)
    

lsr

lsr
active member
active member
I had the same problem with speedo fluctuating when stationary when the battery was below 11 volts. A couple of days on a slow charger made the problem go away.

Did you end up finding the issue?

    

charlie99

charlie99
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i think inge is on the money rene ...

the typical issues with electronic drivers are that without a good reference (earths and supply voltages ) ...the electrical offset can be quite wild in outcomes

have seen some early tackos do similar with overshoot and lag   strangely the later series after 86 perform really well n such things

i suspect a circuit or parts - component change solved these issues

deoxit mate ...and test the connections

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%OExtremely fast bike - speedo electrical issue Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

ReneZ

ReneZ
Life time member
Life time member
Cheers team, finally brought the bike home today after all kinds of shenanigans with registration etc.
First time the opportunity to have a proper ride (from seller to home - about 40 miles), after a quick up and down the street during purchase discussions. Bike steered like a pig at that time and was wondering about the head bearings, forks etc. Today brought a compressor and found front and rear tyres with little air..... So she got some fresh air in her :-)
At the time we wanted to get the bike home, now two weeks ago, I brought a container with super unleaded with techron, as the owner kept the tank very empty. Filled her up and started easy. Fuel looked good (clear) before I put my lot in. Added a bit extra techron and blipped the starter a few times to 'flush' and then started her in honest. All good, no problem. Fitted a spare tacho and it worked good, no full scale anymore, so the original tacho needs some work.....
This morning, after getting the tyres on pressure, decided to bring here home. Barely around the corner she started lurchin and a 100 yards later she quit on me. Lights OK, bright enough, but a few times not turning over/not running the starter. Had brought some tools and quickly determined that the battery was OK, fuses OK, pump could be heard running when you blipped the starter..... Hmmm, meantime 100F outside and inside the helmet serious boiling point was reached! Looked in the tank and found some sort of milky liquid. WTF?! Where did all my fresh expensive fuel go? With the cleaner? Of course I stood there without container and no fuel pump in sight......
Called the seller, explained the situation, told him I needed to get a hose, drain the tank and get some fresh fuel in her. He was good and showed up a bit later with two containers and a hose. We drained the tank as much as possible and filled her up with the fresh fuel. Bike started readily (thank god!) And I was ready to continue the 39.9 Miles.
As My previous bike was a RT and before that a Honda with fairing I had completely forgotten how much wind pressure you get on an unfaired bike. With the temperatures here in Florida not completely unwelcome ;-)
Bike did well, had her up to 80 and she was steady. Rattling muffler shield of course and initially a bit hesitant on the throttle, but the closer to home the better it got. Have her home now. Noted that when using the indicators sometimes they both got on, blinking out of sync. Also the gear indicator went blank, not allowing to start without the clutch pulled, no all the usual issues displayed :-) With the starter issues etc a deep dive in the electronics is required, lots of cleaning to do. Luckily Deoxit on hand and lots of other sh!t.
Anyway, happy to have a bike again!


__________________________________________________
Greetings from Florida! Having a 'new' K  :cyclops:    Surprised-o: 

Rene


BMW K100 - 1985 (0030029) Extremely fast bike - speedo electrical issue Rain
BMW K1200GT - 2003 (ZK01223)
    

charlie99

charlie99
VIP
VIP
woohoo .!!

have fun with the fix up rene


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OExtremely fast bike - speedo electrical issue Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

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