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Thread: 1995 K75 leaking tank.

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  1. #1
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    1995 K75 leaking tank.

    1995 K75 leaking tank.
    I'm thinking of purchasing a 1995 K75 with only 16,000 miles on it. Unfortunately the paint is peeling off underneath where the seem is. This is what the owner is telling me. He say's it's because the ethanol has separated it he gas and the vapors have cause damage. Any opinions on what could be happening and on a bike that has been sitting to long? Thanks. Sincerely Ted....
    Last edited by 143143; 03-28-2013 at 05:55 AM. Reason: wrong number

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    Quote Originally Posted by 143143 View Post
    1995 K75 leaking tank.
    I'm thinking of purchasing a 1995 K75 with only 16,000 miles on it. Unfortunately the paint is peeling off underneath where the seem is. This is what the owner is telling me. He say's it's because the ethanol has separated it he gas and the vapors have cause damage. Any opinions on what could be happening and on a bike that has been sitting to long? Thanks. Sincerely Ted....
    O ring seal in the bottom of the tank is leaking. Remove tank, replace seal, reinstall tank, go ride. ( most likely scenario)
    Be careful, the tank is aluminum.
    '03 R1150R, '03 F650GS, '97DR200SE,'78 Honda CT-90, '77Honda CT-90

  3. #3
    Registered User lkchris's Avatar
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    Water in fuel = corrosion = hole in tank. It's happened before.
    Kent Christensen
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    '12 R1200RT, '02 R1100S, '84 R80G/S

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    I had pinholes in a steel tank - POR15 sealed them

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    Whatever it is, you have to take the tank off anyway. I'll still bet on the O ring.
    '03 R1150R, '03 F650GS, '97DR200SE,'78 Honda CT-90, '77Honda CT-90

  6. #6
    100,000+ miler 32232's Avatar
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    Water corrosion may mildly discolour the aluminum K75 tank, but it won't perforate it. Odds on the leak is at the O ring.
    Dave

    '06 Triumph Scrambler (Trans-Labrador veteran)

  7. #7
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    Quote Originally Posted by Acejones View Post
    Whatever it is, you have to take the tank off anyway. I'll still bet on the O ring.
    I'll take that bet with you and Dave. Two beers at the Rally?

    The O- ring on k75s virtually never leak unless they have been taken apart, while it is quite common for the tank to corrode through (especially on the left side seam just to the rear of the fuel pump) if the bike has been sitting for years with bad fuel in it.


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    Quote Originally Posted by Acejones View Post
    O ring seal in the bottom of the tank is leaking. Remove tank, replace seal, reinstall tank, go ride. ( most likely scenario)
    Be careful, the tank is aluminum.
    Thanks Bro. Sounds like an easy fix.

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    If the tank has corroded can it be fixed?

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    Quote Originally Posted by 143143 View Post
    If the tank has corroded can it be fixed?
    Some people trust epoxy type fixes. I prefer to replace the tank with a good used one. Remember the leak is directly above the header.



    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
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  11. #11
    Bluenoser
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    Quote Originally Posted by 143143 View Post
    If the tank has corroded can it be fixed?
    Steel tanks can be brazed or soldered ( similar to a leaking rad ) but I would think an alum. tank would have to be welded and then sealed with any one of the aftermarket product's out there. Lots won't weld a gas tank.

    You should price the bike accordingly and included the purchase of a used tank, painting etc. Always look at these types of things when buying a used bike as a deal breaker unless you can more than cover the cost of the replacement tank. If the bike has been sitting so long the tank has been eaten through, then you are going to dump more money into the rest of the bike to get it running properly.

    Its always a better deal to find a bike in better condition as you can dump $ 2000. into any of these old BMW's pretty quickly ( even if you are doing all the work ). If at the end you get the bike for a better price and then it turned out to be an O ring, well that's OK and you have another story to tell.
    1971 R50/5 SWB with R75/6 drivetrain
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    I'm moving this thread to "Flying Bricks" as it is about early Ks.

    Head and arms inside the ride please. Here we go!



    LONG MAY YOUR BRICK FLY!

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    Lee Fulton Forum Moderator
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  13. #13
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    Let us know if he was right (I REALLY doubt it).



    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

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