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Thread: '91 K75S Nasty Fuel Tank 2B Cleaned

  1. #1
    Registered User
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    Mar 2003
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    North Georgia Mountains
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    '91 K75S Nasty Fuel Tank 2B Cleaned

    1991 K75S, idle for four years. The fuel pump she no pump and the hoses and rubber donut are mostly semi liquid black tar poop. There is black poop inside the tank where the fuel pump rubber sits and lots of detritus inside the tank generally.

    How would one go about cleaning the tank? Remove it or leave it mounted? Use what to clean the innards? Gas, lacquer thinner, simple green, what?

    Thanx
    Roger Wiles
    roger@rogerwiles.com
    www.rogerwiles.com
    706.897.8266 24/7 Wireless

  2. #2
    Registered User
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    K75S Tank Removal

    1991 K75S. To remove the tank, do I have to remove the front fairing. Any tips appreciated
    Roger Wiles
    roger@rogerwiles.com
    www.rogerwiles.com
    706.897.8266 24/7 Wireless

  3. #3
    Roger,

    Look at the very back underside of the tank. You will find 2 lugs down through rubber grommets. They might or might not still have circlips on the lugs. Once the circlips are not there a sharp upward tug will pull the lugs out of the grommets.

    The wiring to the tank is at the bottom right rear of the tank and unplugs.

    There are two fuel lines at the left side front of the tank. They need to be disconnected. Moving the tank rearward a few inches makes disconnecting the frontmost of these two line easier.

    There is no need to do anything with the fairing.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  4. #4
    Registered User
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    Mar 2003
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    North Georgia Mountains
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    190

    Thanx

    They followed me home. They had to; the trailer had more life in it than the dead Kwhiners. Put a battery in one, and it coughed itself to life. Rides ok. Second one, the S, has ruined tank innards, no front brakes due to a prolly dead master cylinder. ABS is reputed to be dead on the S, too. Dunno yet how to diagnose (assuming I can get it running in the first place) ABS. The breakers should have used stuff for ABS at reasonable money, one hopes. Computers and such. If it runs, then do the master cylinder and fill and flush both front and rear circuits and then see what we got??? I guess???

    My last K bike, excluding the Light Truck, was 1992, so Iím in search of tips and wisdom. Assuming they can be made serviceable, they will be offered as bargain survivors that will prolly outlive us all, if one keeps the gas fresh.
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    Roger Wiles
    roger@rogerwiles.com
    www.rogerwiles.com
    706.897.8266 24/7 Wireless

  5. #5
    Registered User mlytle's Avatar
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    Oct 2015
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    alexandria, va
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    start reading the tech section on www.motobrick.com. you will find the answers...
    Marshall
    92 K75s
    94 K75s
    09 K1300s

  6. #6
    Registered User AKsuited's Avatar
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    Southern Tier of New York
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    Where the driveshaft mates to the final drive: those splines need to be cleaned and lubed with a grease that has moly in it.
    My fleet: 2015 R1200GS, 2017 Toyota Prius Prime (plug-in hybrid)

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