Author Topic: '87 K75S Fuel Light Test???  (Read 3228 times)

Offline jay1622

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  • Posts: 283
'87 K75S Fuel Light Test???
« on: October 02, 2017, 09:30:01 PM »
Aside from removing the gas cap and ensuring the float isn't stuck, is there any way to trick the low-fuel light into coming on? Any way to test the float? I can't recall if it (in a low gas environment) opens a closed loop, or closes an open one. I almost ran out of gas the other day; it worked before this. I'd like to fool the light into coming on if I can. Is there a way?
  • Charlotte
  • Previous: 1986 K75S, 1977 R75/7, 1999 R1200C, 2003 R1150GS, 2001 F650GS, 2005 R1200RT... Current: 2005 R1200RT and my Brick, a 1988 K75S

Offline K1300S

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Re: '87 K75S Fuel Light Test???
« Reply #1 on: October 02, 2017, 10:32:38 PM »
take the gas cap off.   4 screws.  30 seconds of effort.
Project Thread "K75s Midlife Refresh"
http://www.motobrick.com/index.php/topic,7810.0.html

Offline Martin

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Re: '87 K75S Fuel Light Test???
« Reply #2 on: October 02, 2017, 10:44:27 PM »
Put some fuel proof nitrile gloves on and after removing the filler cap and surround you will be able to push or lift the float. There is a toothed wheel that can be CAREFULLY manipulated to move the float up or down, if it is not seized.  You can also adjust it by bending the float wire.You could short out the wires to your light but this would only determine whether your light is working, not the level of when its working.
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline jay1622

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Re: '87 K75S Fuel Light Test???
« Reply #3 on: October 03, 2017, 06:04:21 AM »
Thanks Gents, that part I get, but is let's say it (the gas float assy) is working, and it's the bulb that's out. Or, let's say it's not working and the bulb is out too. I'd like to test both separate and independent of each other.


To get the light to light up, which wires get shorted? Also, and this I can't remember even though I should...  In what operation condition does the light come on when everything is working, and there is a low-fuel condition, i.e. key switched on/kill switch off, or, key switched on/kill switch on? Have to be running (like the fuel pump)?
  • Charlotte
  • Previous: 1986 K75S, 1977 R75/7, 1999 R1200C, 2003 R1150GS, 2001 F650GS, 2005 R1200RT... Current: 2005 R1200RT and my Brick, a 1988 K75S

Offline Inge K.

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Re: '87 K75S Fuel Light Test???
« Reply #4 on: October 03, 2017, 06:35:31 AM »

To get the light to light up, which wires get shorted?


Ignition on, kill switch on, ground the white wire.
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Offline jay1622

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  • Posts: 283
Re: '87 K75S Fuel Light Test???
« Reply #5 on: October 03, 2017, 07:14:32 AM »

Ignition on, kill switch on, ground the white wire.


Good morning Inge. I just happened to be reading a thread in the K100 forum that you took part in, in 2012. All good stuff. I'm reviewing the How-To by Robmack from 2014... http://www.k100-forum.com/t9265-messing-with-the-in-tank-fuel-sender#109294


Thank you for the reply.


J
  • Charlotte
  • Previous: 1986 K75S, 1977 R75/7, 1999 R1200C, 2003 R1150GS, 2001 F650GS, 2005 R1200RT... Current: 2005 R1200RT and my Brick, a 1988 K75S

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