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  1. #1

    piston identification

    Im new on here and just bought a 95 SL 750 with a blown engine . how do i identify what pistons i have . (standard or bored) . the piston says W7A on the top. does anyone know the bore size? any help would be appreciated . Thanks .

  2. #2
    casey67's Avatar
    Join Date
    Sep 2006
    Welcome to Green Hulk.
    The best way to figure out what you are dealing with is to measure exactly what you have.
    If the cylinder is torn up and needs work,the machine shop could do the measuring for you and tell you what size pistons to get.
    The factory bore 69.72mm or 2.744 inch.
    There is a service manual posted on this site that will help with alot of your questions. Enjoy.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    near Toronto, Canada
    Quote Originally Posted by casey67 View Post
    ...There is a service manual posted on this site that will help with a lot of your questions. Enjoy.
    Look here for the Polaris Service manuals.

    Welcome to the Hulk.

  4. #4
    Thanks for the info guys.

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
    Join Date
    Oct 2006
    Cleveland OH
    Welcome to the Hulk redline.

    W7A is a standsard sized 750 from Polaris.

    Depending on damage done to cyls, would dictate what oversize you'll need. So don't buy pistons until a machine shop tells you how much it'll need to cut. OR, you can go well oversized, like 1mm.

    Reason I say that is the 750 can go all the way up to a 2mm oversized Wiseco piston. Or can also use pistons for a 780.

    Alot of piston choices for a 750 available.

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