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Thread: Cylinder help

  1. #1

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    Cylinder help

    hey there,
    I was wondring if anyone can help with my ?' I was wondering if I could just hone 1 cylinder instead of 3 ? and also how can I find out what the standard size cylinder is for a 94 polaris sl 750


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Could you give us a bit of background on this engine?

    Is the cylinder damaged or scratched at all?
    Are you putting a new piston in?

    Do you know what size piston was in there before?

    Do you know why the piston failed?
    Have you corrected the cause?

    As long as the replacement piston does not have excess clearance in the honed cylinder, you can just hone one cylinder.

    However, if the other two cylinders are getting worn (compression is not 100%), then you may want to hone and re-ring the other two, just keep the engine in balance, power wise.

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk Mac.

    You can hone just 1 cyl, but why just the 1? Was it damaged?

    If so, you may need an oversized piston. Which is not recommended, but others have done it with no problem.

    The 750 has a 69.72mm bore (2.74 in).

    Please check out the tech section of this board. Guys have taken the time to post actual service manuals for you to view. Most of your answers will be in there.

    Just so you know, you have a Fuji (blue) engine in that ski. That way you're not wasting your time reading about domestic (red) engines, that have nothing to do with your ski.

  4. #4

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    ok would you know what size rings i would use for the other 2?

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by MAC84 View Post
    ok would you know what size rings i would use for the other 2?
    Click here for the 1992-1998 service manual

    Piston and rings sizes need to be very closely matched to the actual cylinder size. Wear and honing can alter that size slightly, and of course over boring to recover from excess wear or wall scoring creates a larger size cylinder.

    If you could answer the previous questions, that would help us help you.

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by MAC84 View Post
    ok would you know what size rings i would use for the other 2?
    We need alot more info Mac.

  7. #7

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    yes its made in the US...!
    I rencently bought this jet ski from someone and I'm not sure what was wrong with it thats why im not to sure about it!

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    ...94 SL750...
    Quote Originally Posted by K447 View Post
    Could you give us a bit of background on this engine?

    Is the cylinder damaged or scratched at all?
    Are you putting a new piston in?

    Do you know what size piston was in there before?

    Do you know why the piston failed?
    Have you corrected the cause?
    ...
    Quote Originally Posted by K447 View Post
    ...If you could answer the previous questions, that would help us help you.
    Quote Originally Posted by xlint89 View Post
    We need a lot more info Mac.
    Quote Originally Posted by MAC84 View Post
    ...I recently bought this jet ski from someone and I'm not sure what was wrong with it that's why I'm not to sure about it!
    We understand that you are not familiar with the machine.

    However, you are asking for a technically specific answer, which requires that you provide as much detail as you can regarding the current state of the engine.

    Have you downloaded the 1992-1998 service manual, and read through the engine section?

  9. #9
    casey67's Avatar
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    Quote Originally Posted by MAC84 View Post
    yes its made in the US...!
    I rencently bought this jet ski from someone and I'm not sure what was wrong with it thats why im not to sure about it!

    Hi MAC,You need to measure the cylinders to know what size they are ,If some one has done any work on them/over bored them,they will need larger rings and pistons than a stock cylinder.It will completely depend on your cylinders.
    Most good machine shops will measure them for free if they are friendly,hoping you come back for service.


    PS. I hope you were not offended by xlints"s tag line. That is on all his posts.And mearely means all the Polaris are made in the US.

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