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  1. #1

    Foam on the spark plugs

    I just bought a 94 polaris sl750 that was sitting about two years. So I got a new battery and turned it over a few times and took the spark plugs out and there was a whitish foam on the ends that go in the cylinder doesn't that tell me there is water in there? So I drained the fuel and put new fuel in but still won't start? I haven't took the carbs off yet but does anybody have any suggestions?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Welcome to the hulk!

    If you have water/oil mix inside the engine, you need to investigate further. The crankshaft especially does not like being wet. If the connecting rod bearings or the crank shaft get rusty, the engine is going to need rebuilding.

    Carbs that have been sitting are probably going to need disassembly and cleaning.

    There are a number of other updates and checks you need to do, but water inside the engine is a big worry.
    Last edited by K447; 04-11-2008 at 01:03 PM.

  3. #3
    how do i change the crank oil?

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by margofav View Post
    How do I change the crank oil?
    The Polaris Fuji engines are 2-stroke engines. The oil is mixed with the intake fuel/air in the intake tract, below the carbs. The oil is burned along with the fuel.

    Download the Service Manual (links are in the Tech section), and read the engine sections.

    Unlike a four stroke engine, there is no oil reservoir in the crankcase. The only oil in there is the remnants from the last time the engine was run.

  5. #5
    I can't find the link?

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by margofav View Post
    I can't find the link?
    1992-1998 Polaris Service Manual

  7. #7
    Water Bum Rodneyae's Avatar
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    Welcome to the HULK!!!!!

  8. #8
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    First things first,pull all the plugs and crank it with them not in,See if anything sprays out the holes.

  9. #9
    Neal Van's Avatar
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    I Have A 750 Also When I Picked It Up From The Guy Who Had It He Told Me That It Sat For Awhile It Did The Same Thing To Me Clean The Carbs Are A Good Start Plus Clean The Fuel Lines A See What Happens Then WHEN THE GUY PUT IT UP TO SIT HE FOGED THE HELL OUT OF IT
    Last edited by Neal Van; 04-11-2008 at 07:30 PM. Reason: HAD MORE TO ADD

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    Moderator RX951's Avatar
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    welcome to the forum

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