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Thread: 750 sl run away

  1. #1

    750 sl run away

    i have taking it apart for inspection and found a cracked read valve can this cause this condition where when i start it it revs up real high

    any other places to look


  2. #2
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by Robert3 View Post
    i have taking it apart for inspection and found a cracked read valve can this cause this condition where when i start it it revs up real high

    any other places to look
    WELCOME TO GREENHULK
    I dont think that would do it!
    sounds more like a air leak (reed blocks and base of carbs are most commen)
    was it running fine then starting idling high? and does it idle high or keep going up ?
    have fun and enjoy
    mattman

  3. #3
    i bought it this way it starts up fighn then just pegs out the intake gaskets looked ok here is the story behind the ski his daughter took it out losk the kill switch rope and was towed backwards filled the ski up with water i have taking off the carbs and intake and found a brooken read valve so here was my unorthodox testein i got to slow down by puling up on the choke and sprayed brake clean all over the intake and it han no drop or rase in rpms i was think the crank seal???? any ideas sorry for long post

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk Robert.

    Crank seals could definately do that. Conduct a leak down test on the crankcase. That will tell you if the cases have an air leak.

    The cracked reed may have something to do with it as well. I'd replace that for sure.

  5. #5
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    ok
    so pulling up on the choke brings it back down,,then you are in need of fuel!!!!
    you may need to rebuild those carbs ...
    the shadetree way to find the air leak is starter fluid around the gaskets or seals that you are testing ,,,you do this while the ski is running in the water or on the hose just use the choke to keep some what of an evan idle(high or low-just evan) and then spray some at the base of each carb/reed block/rear seal
    if you get an instant rpm rise you found where the leak is
    i bet you just need to tighten all the reed blocks bolts and you should be good
    mattman---thats a long post---got any pics

  6. #6
    thanks for all the help im going to get some reeds and gaskets and tighten it all and see how it do any have any idea of ho had cranck seals are to do ohh and no pic yet

  7. #7

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    1050's had common problems with crank seals on the mag side, and also base gaskets leaks......most commonly after water ingestion. A little bit of hydro-lock and pop a seal or gasket.

    I'd pressure test it, and check the crank index.

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