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fuel gauge calibration PART II

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    fuel gauge calibration PART II

    OK, have tank off and fuel gauge sending unit out. All is clear. On BikeCliff's site there are three varieties of GS1000 service manual. I have downloaded ALL and none seem to have the GS1000G supplement. Only place I can find it is on eBay and some guy wants $20 for TWELVE reproduced pages!!! The issue I am having is that the resistance values I can find are for the models with the smallest tanks. There is a set screw on the wiper that can be loosened and the wiper moved slightly (after all has been cleaned) to get the resistance values approximately. At the low end the manual says .4 gallons is 110 Ohms resistance. Great. The upper end resistance value is limited to the 4.3 gallon tank on the non-G models at 3 Ohms. Will it show the same 3 Ohms for a 5.8 gallon tank?

    Can someone with an actual G manual that shows the various resistance values vs capacity please post those values? I think I have this thing almost whipped...

    The float and sending unit were a bit rusty and the coil was oxidized as was the brass (I guess) wiper. I was also worried about the insulation which had deteriorated and the wire was touching the locating tab just before it turns to the solder point on the back (other side is where the yellow/black wire comes off). I unsoldered the wire and removed the last flakes of fabric insulation and drilled the hole where the wire comes through to accept a piece of heat shrink and straightened the wire out and put heat shrink over it and then put it back in placed and resoldered. It is pretty solid now and the thing seems to work.

    Last "tip" is that the wiper can be repositioned on the wiper arm. I loosened the set screw (M3 x 6 .5 pitch) so that it contacts the coils thing more closely. It did NOT contact the coil very well all through its stroke.

    Again, resistance values for the 5.8 gal. tank would be much appreciated!

    #2
    The following information is from my 850G manual and shows resistance values for fuel volumes in litres. My 850G tank size is about 22 litres, which should be similar to your 1000G.

    1.5 litres = 110 ohms
    2.7 litres = 95 ohms
    6.1 litres = 52 ohms
    9.3 litres = 32.5 ohms
    15.8 litres = 7 ohms
    16.3 litres = 3 ohms

    When full, the resistance can be between 1 ohm and 5 ohms. When empty, the resistance can be between 103 ohms and 117 ohms.

    Hope this helps!
    Last edited by 2BRacing; 08-14-2016, 04:42 AM.
    1981 GS850G "Blue Magic" (Bike Of The Month April 2009)

    1981 GS1000G "Leo" (Bike Of The Month August 2023)

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      #3
      I have a GS1000 shop manual which lists the G model, and I cant find the values for fuel sender. Which makes me think there the same as E models, after all its just the swing of the float arm. I does not know if its in a small tank or a big one, there all about the same height top to bottom.
      My bikes 79 GS1000 1085 checked and approved by stator the GSR mascot :eagerness: and 77 GS750 with 850 top end, GS850g, and my eldest sons 78 GS550, youngest sons GS125. Project bike 79 GS1000N

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        #4
        From the manual.
        My bikes 79 GS1000 1085 checked and approved by stator the GSR mascot :eagerness: and 77 GS750 with 850 top end, GS850g, and my eldest sons 78 GS550, youngest sons GS125. Project bike 79 GS1000N

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          #5
          Thanks... the resistance values are the same as shown as for any of the other 1000 models, near as I can tell. I am thinking that the high and low resistance will pretty much be for low and high resistance irrespective of tank size. Thanks... will let you know if the calibration effort shows any fruit. Still have a number of other small things to take care of.

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