SBT Jetski Engines, Parts & Accessories

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  1. #1
    Jul 2012

    Default JS550 to bore or just hone and rings

    I have a 88 550 that was really hard to get started but ran really good when running. I did a compression check and it is down to 90psi. This engine is bone stock. I pulled the head and checked the bore at top and bottom. It is reading 75.08. Is this enough to justify boring the cylinders out or just hone and new rings? I plan on new crank seals while I have it apart. Is stock bore 75mm or 75.03mm. Thanks

  2. #2
    Jun 2016
    Clearwater, Florida

    Default Re: JS550 to bore or just hone and rings

    Stock is 75MM it sounds like it needs bored to an oversize.

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