BMW K bikes (Bricks)

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club_c

club_c
Life time member
Life time member
The RS only has the red 4 litre warning light. Mine has not lit up since I've had it except on one occasion with low fuel, when it was really cold outside last winter and I was moving it from storage to the garage for some off season maintenance. Yesterday I checked continuity of the wires from the fuel pump multiplug to the dash, all ok, checked the bulb, ok. Pulled the sensor out, it comes apart a little, just a couple of wires with two diodes (?). Not sure how to test the guts of this little beauty. Any ideas on what's wrong?


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"There's never enough time to do it right, but there's always time to do it over."

1988 K100RS SE VIN 01477554
    

RicK G

RicK G
admin
admin
You say it was really cold when it did work so I will put odds on that it is the thermistor in the tank that is supposed to come on at 7 litres. It works by a change of temp by not having the fuel to cool it, it gets warmer and then conducts enough to light the 7l light. If you can't do it yourself then any electronics tech should be able to figure it out and replace it. They go strange when they get old like me.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

charlie99

charlie99
VIP
VIP
wish i knew what those parts were ....i have a feeling that they are using standard type diodes (which all have a thermistor/ heat reaction properties ) just what type are they ?


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OStill don't have a low fuel warning light 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 ..
    

Crazy Frog

Crazy Frog
admin
admin
@charlie99 wrote:wish i knew what those parts were ....i have a feeling that they are using standard type diodes (which all have a thermistor/ heat reaction properties ) just what type are they ?

Check this thread


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Still don't have a low fuel warning light Frog15Still don't have a low fuel warning light Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

charlie99

charlie99
VIP
VIP
thanks bert ...seems the only way is to look up some suitable replacements ...ntc 600 ohm at 25c

although i notice some physical conditions that could affect the operation .

the globe if wonky connections would certainly affect the comparitor operation

the connections at the back of the instrument cluster (known for bad connection) would certainly add to the problem .

tolerance drift of the thermistors (due to heating constantly ) actually wouldnt mind betting they have gone high by now , after all those years .

id be reconning that if you found one that actually works after 100,000 miles - killometers and 25 + years -- take a picture--- that would be a rare bird indeed ....giggles


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OStill don't have a low fuel warning light 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
Does anybody know what replacement thermistors could be used? Type or Farnell no or similar?


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

Rene


BMW K100 - 1985 (0030029) Still don't have a low fuel warning light Rain
BMW K1200GT - 2003 (ZK01223)
    


club_c

club_c
Life time member
Life time member
Solved. Bought a used unit off eBay, installed today, and once everything balanced to temperature (cool gas, warmer air) I have a red light on the dash. Which will be nice. I went on a ride this summer thinking I'd be ok, up and down some steep hills on the highway, as I would climb, the gas would slosh back and I'd get a bad miss, flatten out or go down, the pump would get enough gas. Limped into a fuel station and had to coast the last 50m. As soon as I stopped the bike, the engine stopped. Don't want to do that again. I'm still pulling bits of the seat cover out of my sphincter.


__________________________________________________
"There's never enough time to do it right, but there's always time to do it over."

1988 K100RS SE VIN 01477554
    

charlie99

charlie99
VIP
VIP
yay good work


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

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OStill don't have a low fuel warning light 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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