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  1. #1

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    95 sl750 oil in intake

    My 95 sl750 has sl780 carbs on it, and triple outlet fuel pump. It sat all off season, ran ok last summer but now I went to start it and the oil tank is empty, and the intake and carbs are filled with oil all the way to the throttle blade.

    Any suggestions on what might have caused this, or where I should start looking for the problem?

    Thank you


  2. #2

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    I guess I am the first to experience this.

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    Last edited by K447; 06-15-2014 at 08:52 AM.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Probably not the first, but it does not happen very often, it seems.

    I think the oil feed nipples on each cylinder have internal check ball valves. These are supposed to only open when there is some oil pressure from the oil pump. If one or more of these check balls is stuck open then gravity would allow the oil from the tank to flow through the oil pump and dribble continuously into that cylinder.

    Inside the engine the liquid oil can travel through the labyrinth seal between crankcase sections, thereby filling all the crankcase. This process would be fairly slow, of course.

    When were the carburetors last removed and rebuilt? This might be a good time to remove the carbs for rebuild and at the same time clean and test the oil check valves.

  4. #4
    BlueFishCrisis's Avatar
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    Just out of curiosity, where are the oil lines connected? The 780 carbs have nipples on the carbs for the oil, but the 750 would either be connected above the carbs in the flame arrestor (although it looks like you may have the OP F/As on there), or below the carbs on the intake manifold....?

  5. #5
    BlueFishCrisis's Avatar
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    Either way, at least the crank won't be rusty!!!

  6. #6

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    The carbs were rebuilt about two years ago.
    The oil lines are in the stock 780 location.
    Are the check valves in the carbs?

    That is true about the crank!!
    thanks for the help.

  7. #7
    ripcuda's Avatar
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    My first thought was "DANG. At least it's not water!"

    I just tested the oil squirters on my SLT750 ('95 injects in flame arrestor throats above carbs). It took more pressure than I could make by mouth... a few psi from the bike tire pump and they all squirted. The check valve in the oil injector tip prevents (when working) what happened to you.

    Cheers!
    Last edited by K447; 06-15-2014 at 10:16 PM.

  8. #8

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    Should I put the 750 check valves on right before the black 780 carbs?

  9. #9
    ripcuda's Avatar
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    Your 780 carbs have the oil lines connect directly to each carb. The carbs have the internal check valve in them. Whereas the 750 ('95) has injectors fitted into the flame arrestor throat above the carbs.

    Your using aftermarket flame arrestors so you'd have to fab a spot to put 750 injectors in there. I'd just pull the carbs, clean them and get the internal check valves working them.

    Cheers!

  10. #10

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    Ok, thanks for the help.

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