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  1. #1

    1993 750 SL Help Needed

    Need advice/guidance on crankshaft and piston/rings replacement

    Rear main bearings disintegrated with parts showing up in #3 cylinder. Broke down engine to access the crankshaft. Found two other bearing that doesn’t spin correctly. Looking to replace the crank. Is buying a crank from someone parting out a ski asking for trouble, or should I go re-manufactured route.

    I have to replace the #3 piston do to damage. How can I tell if cylinder was honed and need to replace with oversized piston and rings? The other two pistons look ok, but I am considering replacing rings. These pistons have a 1.00 stamped on piston. Does that mean they are the originals?

    Suggestions for getting this ski back online without spending a fortune?

    Thanks in advance.


  2. #2

    Join Date
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    Buying used is not necessarily a bad thing as long as the crank is good.
    For the piston having 1.00 means the cylinders have already been bored and I believe that might be the max allowed but I am not sure of that. you can have the cylinder honed as long as it is still good and replace the piston and the rings with same spec of the old one

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Used cranks are a crap shoot, but mucho cheaper than rebuilt. I guess the question is, do you feel lucky? The 1.00 is bored 1mm over already. I think you can get up to 1.5mm before needing new sleeves. Not positive, but you can look into it. Otherwise you can get a single piston kit from Ebay for $72, or get a different cylinder if yours is beyond repair. Good luck.

  4. #4
    The damage to #3 piston makes it impossible to read any stamps on top of piston (see pix) to determine if it is oversized.

    Is the there another way to measure difference?
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  5. #5

    Join Date
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    you can take them to a machine shop and they could measure them for you.
    You should also bring your cylinders and pistons but make sure you mark each one, you what to keep them paired with each other

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Get some gas to them boys, LEAN!!!!!! Try cleaning the tops with some gas or a degreaser maybe, or get an accurate measurement of the cyl bore. You need a micrometer, and we'll tell you if you're overSized or not.

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