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  1. #1

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    2006 gp1300r big bore build. Need help!!

    I'm building a 1300r Efi big bore. Cylinders are already bored to 87mm pistons by millenium technologies. All three cylinders are ported as well. Plan on running an r&d speed plate. riva free flow kit. Efi power filter. Using a hot rods crankshaft. 3 degree keyway. Gp1200r Waterbox and that's it for now. Any thing else I must have?

    87mm pistons
    Power filter
    3 degree keyway
    R&D Speed Plate
    Ported Cylinders
    Gp1200r Waterbox
    Riva free flow kit
    Pump tunnel reinforcement
    Pisser delete
    D-plate which needs to be grinded down some but don't know how much?

    Anything else?


  2. #2

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    Anything anybody?

  3. #3
    Moderator OsideBill's Avatar
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    I dont see an EFI Controller on your list

  4. #4

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    Pisser delete? Most guys add one or two.

  5. #5

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    Do I need an Efi controller or will it run ok without one

    Pisser delete as in the one off the pump nozzle

  6. #6
    Moderator OsideBill's Avatar
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    you need one have to give that big bore fuel

  7. #7
    04gtxsc's Avatar
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    Not the expert but without one I bet you will be replacing pistons and cylinders real quick.

  8. #8

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    You need the right size prop, head cut to 87mm and milled, intake grate. Power filter is optional. I never run one. You will also need to clearance the case for 87mm pistons.
    And if it was mine, even on a stock motor, I'd put some VF2 or VF3 reeds in it. Major power increase for the money, no other reeds compare.

    The Efi controller is a must, 1390's are known to cook pistons even with a controller if its not set high enough.

  9. #9

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    Looks like I'll be ordering a controller. Anyone have a set of reeds for me on here? And any idea on what size prop? Start with dynafly 14/20...

  10. #10

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    Start with the dynafly 14/20 and have it pitched up. Depends on how strong your 1390 is, but with reeds most turn between a 14/23 to 14/25

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