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Thread: Jetting

  1. #1
    fastkaz's Avatar
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    Jetting

    what jets are recommend to buy for a 1390 big bore kit?


  2. #2
    My son (mohawk man) jeffsntx's Avatar
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    You need to talk to whoever did the engine/port work. There is a pretty big difference between one set-up to another.

  3. #3
    fastkaz's Avatar
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    im doing the portnig my self

  4. #4
    quadzilla's Avatar
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    Exclamation Really..???

    ...?????

    Have you done this before..????

    This could/would be one EXPENSIVE mistake if not done correctly..

    From what i've read, the jetting can actually be less than for a 1200, due to the increased carb signal..!!

    Major reasearch time for you partner...

    Good Luck...

    Gerry

  5. #5
    All hail the Chief! fullboogie's Avatar
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  6. #6
    Yellow93's Avatar
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    Quote Originally Posted by fullboogie View Post
    X8543013!

  7. #7
    All hail the Chief! fullboogie's Avatar
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    Say what?

  8. #8
    Yellow93's Avatar
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    I was agreeing with you David...


    I've seen someone try and port an Eaton without any experience... wasn't pretty!

  9. #9
    fastkaz's Avatar
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    im takin the cylinder to a machine shop to make them bore them. i have a mechanic that can rejetted it. if i bore from a 1300 to a 84.5 or a 85 mm can i use the stock head or do i have to buy riva heads?

  10. #10
    My son (mohawk man) jeffsntx's Avatar
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    Can the machine shop also plate them after they get done boring them?

    You will have to send a head to someone like lowell for special work to be done to it. You cant just "buy" a head for a 1390.

    I really think you should do a LOT more research before you start on this project. I am not doubting your skills, but you should talk to someone that has built one or at least owns one before you try this.

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