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  1. #1
    rwc297's Avatar
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    96 slt 780 front piston :(

    finally got the ski running and ...yep you guessed it the front piston went. good news is no scoring on the cylinder walls but the head is toast as well as piston. should i replace jug as well?


  2. #2
    ryandi2's Avatar
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    post pictures of the damage.. best way too help you out

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Cyl will most likely be fine. I'm more concerned about the aluminum grit that made it's way into the crank bearings.

  4. #4
    rwc297's Avatar
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    780 piston

    i dont think any could have gotten there the piston was still basically intact but blown around the edges,will send pics asap. thanks for your help
    steve

  5. #5
    ryandi2's Avatar
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    youd be surprised..

    clean up the fragments.. then remove the cylinder... and check out the cases is best you can you might want too remove all the cylinders and clean the cases...

    what i did once when my sl650 was getting a new top end.. was when me and my uncle had it apart we cleaned the cases by taking a good rag that had no fuzzy's and wiped the case between the crank and the case its self.. and the ski ran fine after that..

    the middle cylinder had chunks missing so we cleaned it out good..

    just a thought

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by rwc297 View Post
    i dont think any could have gotten there the piston was still basically intact but blown around the edges,will send pics asap. thanks for your help
    steve
    Did it look something like this?



    Because that left enough debris in my crank bearings to make them almost seize. If I hadn't thoroughly cleaned the bearings, I woulda lost the new engine quick.

  7. #7
    ryandi2's Avatar
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    Quote Originally Posted by xlint89 View Post
    Did it look something like this?



    Because that left enough debris in my crank bearings to make them almost seize. If I hadn't thoroughly cleaned the bearings, I woulda lost the new engine quick.

    ouch .. x howd that happen?


    yeah cleaning the cases is your best bet.. try what i said.. my middle pistonhad nasty marks on it.. like woverine used as a scratching post...

    so there was stuff in the cases but we got it all out with out taking the motor out of the hull or splitting the cases...

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Debris in your cases is one thing. (will eventually get into the crank bearings)

    Debris in your bearings is another.


    Ryandi, that's what happens when you run WOT with very little fuel. It got so hot exiting the cylinder, it ate the aluminum. Once the dome was gone, the ring got snagged on the exhaust port and gave it the "Alfalfa hair do".

  9. #9
    ryandi2's Avatar
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    ouch ouch ouch... and i thought my middle piston was bad on the old 650..

    it looked like a shark with metal teeth used it for a chew toy.. but that ski was beat like a mule on a hot day..


    rwc.. its hard too tell if you got metal in the bearings.. but what i would do is what i said before.. take all the jugs out and go from there... you probably are fine but probably doesn't fix your crank...

    just take a look and see what you can find..

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