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  1. #1
    Addicted Member 5001craig's Avatar
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    '95 SL750 won't get on plane

    Hey there. I've searched for a similar thread unsuccessfully.

    My buddy's '95 SL750 has always screamed. This year not so much. I finally rode it tonight and it wouldn't get on plane. There's oil soaked in the intake and it appears to me that the engine is spitting the oil out of the intake into the hull, where there is a considerable amount of oil. There's also oil on the cylinders--not a ton but some.

    We pulled the plugs tonight and they look pretty good to me--light tan in color, no oil on them. This was after I spent around 10 minutes trying to get it on plane. Can't see anything visible in the engine compartment as to where the oil is coming from.

    I am thinking fuel accelerator pump (just from the similar threads I've seen here), reed valves or possibly carburetion issue. Any help would be greatly appreciated.

    Thanks in advance.

    Craig


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Check the basics.

    Cylinder compression. All spark plugs out, throttle held wide open.

    Check all the oil injection hoses. Sounds like one or more have come off.

    After that comes reed valves, fuel system/carbs. And of course electrical/ignition.

    Lots of possible things to check...

  3. #3
    Addicted Member 5001craig's Avatar
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    Thank-you Sir!

    We did check compression and they were all within 1 psi at around 120 I believe (that was a few weeks ago).

  4. #4
    BlueFishCrisis's Avatar
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    Re-check compression now that you are noticing the issue. The Fuji carbs do not have Accel pumps, but do like to have their fuel pumps replaced with triple outlet models.

    What kind of RPM is it running at?

    Check that you have strong spark on all three cylinders. If not, you will need to verify all of your grounds are clean and solid.

  5. #5
    LaveyT's Avatar
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    When I had a broken reed petal the problem would come and go. The broken petal was moving around.
    Last edited by K447; 07-30-2014 at 08:57 AM.

  6. #6
    Addicted Member 5001craig's Avatar
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    Quote Originally Posted by BlueFishCrisis View Post
    Re-check compression now that you are noticing the issue. The Fuji carbs do not have Accel pumps, but do like to have their fuel pumps replaced with triple outlet models.

    What kind of RPM is it running at?

    Check that you have strong spark on all three cylinders. If not, you will need to verify all of your grounds are clean and solid.
    We checked the compression when he first noticed the problem. I got it to turn just under 3K rpm's the other day when I rode it but would not go higher. Spark is what he and I would not consider strong...

    Quote Originally Posted by LaveyT View Post
    When I had a broken reed petal the problem would come and go. The broken petal was moving around.
    Interesting. I've kind of thought that it's a reed valve. Only because it seems like the engine is blowing the oil out of the intake and I believe that's where it's coming from in the hull. The intake is full of clean oil.

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Try running it on one cylinder at a time. Ground the other two spark plug wires, leave all spark plugs installed.

    It should be able to start and run, roughly, with only one cylinder firing.

    Then ground that plug wire and reconnect the next cylinder. Start and run, again roughly and similar to the first.

    Then test the third cylinder.

    If it will not run with one of the single cylinders, focus attention there.


  8. #8
    BlueFishCrisis's Avatar
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    Quote Originally Posted by 5001craig View Post
    Interesting. I've kind of thought that it's a reed valve. Only because it seems like the engine is blowing the oil out of the intake and I believe that's where it's coming from in the hull. The intake is full of clean oil.
    Then pull the carbs and intake and have a look see....

  9. #9
    Addicted Member 5001craig's Avatar
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    Thanks a ton guys for the help. Much appreciated.

    I've always felt the Polaris guys were the friendliest.

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