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Thread: Petrol in the oil - after long lay off

  1. #1
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    Default Petrol in the oil - after long lay off

    gsx250e 1980

    - been stood for 3 months - last run was perfect. petrol in tank
    - started it up and was hard to start but usually is after a lay off
    - put it on res as thiught may be low on fuel.
    - then just would not start at all.

    - Saw a line of fuel from where i had tried to bump it
    - petrol in the oil big time ! another inch up dipstick.
    SO
    - Ring s- no way
    - floats on carbs ? poss
    - But before i have had this not so bad but when the fuel petcock disintegrated.

    - petcock off and there was dirt blocking a small hole.
    - cleaned blew out
    -petrol doesnt not flow in normal mode but does freely in res Q) is this right ? should it flow freely in res ?

    Anyway. Petcock i think fixed.
    do i need to check the floats ? (a pain)
    Attached Images Attached Images
    Last edited by ukjules; 07-22-2021 at 08:18 AM.
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

  2. #2
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    Default

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

  3. #3
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    A common problem with some Suzuki Vac taps regardless of the condition of the float valves and heights.
    Fuel will just weep past them when standing for long periods.
    Had it happen couple of times and fitted an inline manual tap as insurance.
    Sounds like you know the procedure to drain the oil and spin the motor with the plugs out to clear it out before filling with fresh oil.
    As for the tap, depending on the type it should have prime , on and reserve.
    Prime should be the only one that flows with the engine off.
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  4. #4
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    Pet cock should flow fuel freely only in Pri. position. ON & Res. should require vacuum to open & let fuel flow. Yes, gas in crankcase you have both a not sealing pet cock & a leaking needle & seat. Just my opinion.
    1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

  5. #5
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    Thanks guys.

    Never had an issue with the carbs and engine is as sweet as can be.

    The tap flows in rsrv like a fountain ! and at some angles in normal mode. the diaphragm looks fine but there has to be
    soming wrong internally.
    On that tap there is a prime screw.

    am considering this from wemoto. pipes point wrong way in pic but it has a prime on it , a proper one.
    and i have a load of tubes to try. ill go for the petcock first and see.
    A risk as i may needd to strip the carbs but ill take it one step at a time
    wemoto petcock.JPG
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

  6. #6
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    Another story that validates my decision to go with a Pingel tap a couple of years back. Having said that I am thankful that I am so anal about turning it off each time when I should.
    Larry

    '79 GS 1000E
    '93 Honda ST 1100 SOLD-- now residing in Arizona.
    '18 Triumph Tiger 800 (gone too soon)
    '19 Triumph Tiger 800 Christmas 2018 to me from me.

  7. #7
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    OIl drained - plugs out engine turned over and all fluid out.
    Will try again wemoto as i kinda like em and get the one for 50.
    No pingel for this little bike but poss for my 550e if and when.

    Will update if i is just tap as im taking a risk as got too much to do to start on a carb refurb (even though
    i could do it in an eve)

    to do:

    oil in
    new petcock on and try it .....
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

  8. #8
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    》 I so hope I havnt got floats that are
    wrong but I'm taking a punt at only the
    petxock . one ordered 35. another risk
    but it had a good right up from.seller.
    (ebay non standard )
    on , res and prime and def fits.
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

  9. #9
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    salty_monk is offline Forum LongTimer GSResource Superstar
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    The float valves should hold the fuel back even if the petcock is leaking..... To get this you have to have leaks on both as stated above.

    1980 GS1000G - Sold
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  10. #10
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    Petcock ordered. hopefully a better one

    needle valve / seat

    OK so very likely fitting a new petcock
    and needing a vacuum this should solve
    what is happening BUT
    not the underlying additional invisible issue.

    I can whip the carbs off as I'm sure it's
    not the hellish job as on my 550.
    Would a clean up do or a new needle valve is needed ?
    the needle valve seat ... nothing can be done about that?

    I think my old gsx250e deserves more than half
    a job so it's off with the carbs .
    UKJULES
    ---------------------------------
    Owner of following bikes:
    1980 Suzuki GS550ET
    1977 Yamaha RD 250D
    1982 Kawasaki GPZ 750 R1
    1980 Suzuki GSX 250E

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