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Thread: Petrol in the oil - after long lay off

  1. #11
    Join Date
    Jan 2015
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    Somerset, UK
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    Looked through box of parts and have 2 new
    needle valves. Now just need time.
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

  2. #12
    rphillips is offline Forum Sage Past Site Supporter
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    Jun 2005
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    Norene TN
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    I've not been into a GS250 carb, but the seats are replaceable on the larger bikes. I had a set of GS1100 carbs off & opened up 4 or 5 times trying to get the leak fixed. Finally discovered the "O" ring on the seat was the culprit.
    1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

  3. #13
    Join Date
    Jan 2015
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    Somerset, UK
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    Forgot how easy it is to get gsx 250
    carbs out.
    Quicker than having shave.

    town for some tinnies and then I'll
    strip the needle valves out and replace
    it all while having a garden party sat in a chair.
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

  4. #14
    Join Date
    Jan 2015
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    Somerset, UK
    Posts
    909

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    pulled the carbs.
    removed floats , needle valve and of course
    the tube thing that seats the needle valve
    as per pic.
    I used to be able to do this with my eyes shut
    and forgot about the removable seat ..
    .

    anyway new seats don't fit and needle valves
    too small. this from ebay years ago.

    so old seats and valves back in for now
    and I'll order from dealer. but will
    risk new tap only.

    20210724_201114_resize_66.jpg
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

  5. #15
    Join Date
    Jan 2015
    Location
    Somerset, UK
    Posts
    909

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    update :
    Only place I can find needle valve and
    bowl (seat) is cmsl 38 each for
    valve and seat per carb.

    I hope a clean up will do and new
    tap. Mad the price if carb bits!
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

  6. #16
    Join Date
    Jun 2021
    Location
    Ipswich MA
    Posts
    52

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    I had my petcock fail and a float needle didn't seal, dumped fuel all over the floor through the overflow hose.

    I'm thinking I should change my oil, I don't see gas floating on top but smell it when I open the reservoir. How many turns of the crank after draining the oil is needed to clear any gas?
    1978 GS 750 E

  7. #17
    Join Date
    Sep 2012
    Location
    Ireland
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    None, if you haven't run it with the fuel-contaminated oil.
    ---- Dave
    79 GS850N - Might be a trike soon.
    80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
    79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
    92 XJ900F - Fairly Stock, for now.

    Only a dog knows why a motorcyclist sticks his head out of a car window

  8. #18
    Join Date
    Jan 2011
    Location
    NoMo, MN
    Posts
    3,453

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    Quote Originally Posted by Forden View Post
    I had my petcock fail and a float needle didn't seal, dumped fuel all over the floor through the overflow hose.

    I'm thinking I should change my oil, I don't see gas floating on top but smell it when I open the reservoir. How many turns of the crank after draining the oil is needed to clear any gas?
    Leaking gas flows out the back of the VM carbs, it's the CV carbs that dumps into the oil - you're in the clear.
    -Mal

    "The only reason for time is so that everything doesn't happen at once." - B. Banzai
    ___________

    78 GS750E

  9. #19
    Join Date
    Jun 2021
    Location
    Ipswich MA
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    That's good news. I was worried because there was fuel leaking through the filter of the offending carb, and I thought it must have surely run through the other side into the cylinder head.
    1978 GS 750 E

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