F650 GS '00 fueling issue

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Thread: F650 GS '00 fueling issue

  1. #1
    Join Date
    Aug 2020
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    Default F650 GS '00 fueling issue

    Hi All

    Having fitted a PowerBoost and a 15 tooth sprocket to ease commuting and filtering, I note that when on the open road and get to 70mph, the bike feels like it needs to go onto reserve, I slow down and it picks up till I open it up again. I am thinking the fuel filter is the culprit plus the thing on the end of the fuel pump?
    However I have also fitted a new battery as 3 of the cells on the old battery where half empty, could a faulty regulator/rectifier cause similar issues?

    regards
    Derek

  2. #2
    Bike
    F650(1997) & F650GS(2000)
    Join Date
    Aug 2004
    Location
    Bedford.
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    838
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    Check charging rate / voltage first.

  3. #3
    Bike
    02 dakar
    Join Date
    Dec 2019
    Location
    Scarborough
    Posts
    79
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    Would you not start by running the bike without the boost plug to see if it's that messing with the fuelling ?

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  5. #4
    Join Date
    Aug 2020
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    Default

    I have should have said that the problem was happening pre boost plug.

  6. #5
    Join Date
    Aug 2020
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    I bought a cheap multimeter from screwfix and have checked the battery / vr:

    Battery - 12.92v

    Engine running at tickover - 14.35v

    Engine running at 4000rpm - 14.16v

    The battery is a brand new Motobatt, the engine was cold, could not take it for a run first as the back wheel is out (tyre fitted wrong way round).

    The above does suggest that the VR is working ok though?

    Took the fuel pump out to check the filter on the end, that was clean. (Wish I had not filled the tank right up the previous day!)

    I removed the plug from the airbox pipe and loads of gunge poured out so will check the airbox sensor as that could be covered in said gunge.

    I will also find someone to test the TPS for me as the misfire / fueling issue seems to occurs at a steady throttle 70 - 80mph.

    regards
    Derek

  7. #6
    Bike
    GS/Gd Dakar 2003
    Join Date
    Oct 2008
    Location
    wakefield
    Posts
    1,714
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    Battery/ VR in my opinion if with in expected range. Pre 2000 bikes with older generator/ VR gave trouble, post 2000 bikes rarely give grief.

    engine breather vents into air box, make sure not blocked.
    overfilling engine oil can dump excess into airbox

    check your bike throttle cable is not fitted in " restricted mode" 2 settings, see FAQ's for full info & pics.
    max power is 35 bhp for learners and certain markets, unrestricted is 52bhp. Riders report engine feels like governed around 70-75mph .
    Last edited by kuyajonathan; 05-10-2020 at 06:47 PM.
    2003 GS Dakar
    BMW Panniers, top box, tank bag
    + loads TT stuff that came with it!


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