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  1. #1

    I need help quit!!

    Doing a complete engine rebuild and it's a 01 951 (carb).. I need to know the squish thickness from the top of the case to the bottom of the jugs.. The place that I'm ordering from says there r 3 different sizes..

    Thank you!!


  2. #2
    flyin' the friendly skies airbornexp's Avatar
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    Three different sizes of what?

  3. #3
    Mothman's Avatar
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    I assume you mean base gaskets. If so, ask the height of each, then whip out your measuring tools. Put the cylinder and piston back on along with any head gaskets/orings and measure squish clearance. 0.038in is minimum required allowing for rod stretch (on a bike anyway) for race fuel. Look up the stock squish clearance or shoot for 0.050 to be safe. Hopefully a 951 builder will speak up!
    Good luck!

  4. #4

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    .085" is stock oem 947/951 squish-- 6 hole base gasket w/ unmolested cases, cylinder and head.

  5. #5

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    what do you mean by unmolested cases,cylinders and head?how can you tell if its unmolested or not?thanks

  6. #6

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    Quote Originally Posted by nikko mercado View Post
    what do you mean by unmolested cases,cylinders and head?how can you tell if its unmolested or not?thanks
    heads can be cut for added squish, cylinders can be cut from the top or bottom, cases can be cut from the top. If you are using oem unmolested seadoo parts the .085" squish is very consistant. For example: .020" (or any amount within reason) can be taken off the cases and the squish turns into .065"

  7. #7

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    You use the base gaskets to adjust your squish in your head. If you are running bad gas, go with this thickest. If want a higher compression ratio, go with the thinnest.

    The best way to figure this out is put your motor together, then check your squish with some solder. Then figure out how thick of a base gasket you need. Doing a search on squish and solder should yield a good guide. I don't feel like retyping an essay.

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