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  1. #1

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    94 SL 750 piston size

    I put a hole in my ,mag piston on my SL 750, wanted to use one of my used pistons and jugs from my old 750 slt, both are 94's. The pistons are differant sizes. My SL 750 measure at 69.59 mm and stamped 0.50. My SLT measure at 69.09 stamped W-7A. Gonna buy a new wsm piston kit to fit the SL jug. Went to Atlantic ski and looked it up heres the measurements I found there, 69.75 is standard 750, 0.50 oversize is 70.25. If I buy a 750 piston oversized 0.50 wont I have the wrong size for my jug? Do I buy a 650 piston? Im gonna check on that. If you can help I can order my piston.


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Have you measured the cylinder the piston will be going into?

    If the part numbers on the cylinders are the same between the two engines, you could transfer the matching cylinder and piston as a set from one engine to the other.

    Just be sure to use the exhaust manifold to 'clock' the installed cylinder into alignment before you fully torque the cylinder down to the crank case.

  3. #3

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    I took it apart and marked the pistons and jugs for reasembly. Plan on getting a new piston kit and in stalling to old jug that looks like it's in good condition. The new piston needs to be the right size. I just dont understand how I end up with a size that does not match to what I read. The piston I want to replace does have 830 written inside it

  4. #4

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    Does the 830 mean anything? Is that a part number?

  5. #5

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    Do I have the wrong idea here? Has anyone else replaced just 1 piston? Not getting any response here

  6. #6

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    post a pic of the top of the piston

  7. #7
    BlueFishCrisis's Avatar
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    Jay - I think you have an issue with the calipers. From reading your post above, it seems that they are reading the difference between the W7a (stock) and the .50 over as the correct spread of .50. Most digital calipers have a zero reset that, if done incorrectly, can give bad results. When completely closed, they may read a negative number similar to the offset between standard size of 69.75 and 69.09 that you are getting. I would get another set of calipers and re-measure, including the bore of the cylinders. My gut is that you want a .50 over piston to replace the existing .50 over piston that is in your SL, but the caliper readings are screwing with you......

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