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  1. #1

    03 gp 1300 question

    has anyone used 87mm pistons on the gp1300? retaining the fuel injection.


  2. #2
    sleeplessnMS's Avatar
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    OH YEA

    Yep! 04 gpr KPG 1390cc EFI 93 octane~ ski has been 84+

  3. #3
    thats what i want to do, where should i buy pistons and i assume i get it replated? can you help me with any other mods.

  4. #4
    Nothin' runs like a Deere IowanGPR's Avatar
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    SEND YOUR R&D PLATE TO JIMS1300 NOW!!!

  5. #5
    how do i caontact him?

  6. #6
    Moderator OsideBill's Avatar
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    Quote Originally Posted by IowanGPR View Post
    SEND YOUR R&D PLATE TO JIMS1300 NOW!!!

    Ditto that cheapest MPH per dollar gain by far.

  7. #7
    Moderator OsideBill's Avatar
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    Quote Originally Posted by carl sagan View Post
    how do i caontact him?
    Look in the tuners section for Jims1300 thats him. He is at MudBug this week he has a note posted there for info.

  8. #8

  9. #9

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    There are a few people out there with 1390cc (87mm) pistons with EFI.

    Kerry Hibdon has built some very nice running 1390 EFI ski's. Nearly all of them run an 80mph+
    You will have to get your cylinders ported for this work correctly. I don't think you can just bore, replate and put them in. The head and power valves will also need work.

  10. #10
    how do i get in touch with kerry?

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