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  1. #1

    99 Polaris SLTH 700

    Hey, I'm new to the forum and I'm trying to fix a Polaris for a friend. Had zero compression in one cylinder so I pulled it to find that the piston skirt had broken off and wrecked the piston. The cylinder still looks pretty good, there are a couple very small pits in the wall. Are these cylinders nikasil coated? Should I crack the cases to make sure no metal from the piston skirt is in the bottom end or is it safe to just do a top end rebuild?

    Thanks


  2. #2
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    The cylinders are iron sleeved. I would definitely split the cases, its a good time to check out the crank. You can find bearings that are bad with the crank out of the cases. It may appear to spin smooth in the cases. Having the cases opened up will allow you to replace the crank seals as well. The 700s are cheap to rebuild, relatively speaking, so its worth doing if you want to keep the ski around a while. Have a look at my project here....

    http://www.greenhulk.net/forums/showthread.php?t=144403

  3. #3
    Thanks. Also, does anyone know where I can download a repair manual online? Where can I find the torque specs for when I'm putting the motor back together?
    Last edited by hink320; 05-10-2013 at 11:06 PM.

  4. #4
    I tore down the motor and found that the PTO rod bearing blew out, which probably cause the piston skirt to break off. Found some metal shavings in the cases and some obvious wear spots in the cases. Does it look like I can still use these cases? All the bearings on the crank seem like they're in great shape, but I obviously have to replace the rod and bearing. Might as well just do a full rebuild? Or do you think buying an SBT motor would be more cost effective?

    Here are some pics:

    Click image for larger version. 

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  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by hink320 View Post
    ... Should I crack the cases to make sure no metal from the piston skirt is in the bottom end or is it safe to just do a top end rebuild? ...
    Quote Originally Posted by hink320 View Post
    I tore down the motor and found that the PTO rod bearing blew out, which probably cause the piston skirt to break off. Found some metal shavings in the cases ...
    This is why it is better to fully inspect a damaged engine, rather than guess or hope that the engine bottom end is still in good shape.

    It is easy to talk yourself into believing or hoping that the stuff you don't inspect is ok, but often enough it turns out that you should have just done the 'extra' work up front.

  6. #6
    So does it look like the cases are still usable to you?

  7. #7
    Do you guys have good experience with SBT engines? The price of their standard motor is basically the same as it would cost to do a full rebuild, so I think I'm going to go that way.

  8. #8
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    If you do the rebuild yourself you will end up with better quality parts in your motor.

  9. #9
    What about pwcengines.com? They have a two year warranty, do they use better quality parts, it's only $699 for a rebuild.

  10. #10
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    Quote Originally Posted by hink320 View Post
    What about pwcengines.com? They have a two year warranty, do they use better quality parts, it's only $699 for a rebuild.
    I think he uses all WSM parts. Give them a call. I have talked to them before. Seemed pretty knowledgable

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