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  1. #1
    spud's Avatar
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    Pistons for Cylinders

    How can I be sure I have the right GP1200R piston with a cylinder?

    Do I need to measure the piston with a micrometer and the bore with a bore mic?

    I have some pistons and cylinders that came with the project ski. The cylinders were in one box the pistons in another. Too complicate matters more I have 2 PRO-X pistons and an OEM.

    I sure would appreciate some help with this. If I sell a cylinder I would like to include the proper piston with it.


  2. #2
    Crash Test Dummy Smitty's Avatar
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    The cylinder will have a number stamped into the top of it, above the powervalve port, 0-18. OEM pistons are color coded to match cylinders as follows.

    0-5 Red
    6-10 Orange
    11-15 Green
    16-18 Purple

    As far as part numbers, the correspond to the A,B,C, and D designator in the piston part number (Red is A, Orange is B and so forth). As far as where the color code itself is on the piston, I can't help you.... and as far as pro-x pistons, can't help you there either. Can anyone else finish up for me?

  3. #3
    spud's Avatar
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    Thanks Smitty. I'm sure the color is gone from the OEM piston and the Pro-X don't seem to have color or a code like the stock pistons. I need to clean the carbon off and see what they say.

    The cylinders and pistons I put into the project ski will be coming from Lowell and marked so I'm not real worried about them. I'm just looking at my extras trying to figure it all out.
    Last edited by spud; 07-29-2006 at 10:26 PM.

  4. #4
    Moderator RX951's Avatar
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    Read my Sticky
    http://greenhulk.net/forums/showthread.php?t=9613


    And yes, use a Micrometer to double check.

  5. #5
    Moderator OsideBill's Avatar
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    Jim,
    I have some equipment to measure your bore sizes and Piston diameters in my garage give me a call.


    OsideBill

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