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  1. #1

    head milling GP1300R

    planning to change the cat to a d plate and thought since i would have access to the head then to take out a layer of the gasket to increase compression a bit. told i should have the head milled. who does this and how much $ are we talking to have a pump gas safe head. This is for a GP1300R with 98 hrs, all stock, and compression120-122 all 3 cylinders. Riva heads are expensive, don't know if they are pump gas safe


  2. #2
    Mike's GPR's Avatar
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    Talk to jims performance in Florida, very affordable. Been running my stock head machined to 150 psi for a few years now.

  3. #3
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by strokersquid View Post
    planning to change the cat to a d plate and thought since i would have access to the head then to take out a layer of the gasket to increase compression a bit. told i should have the head milled. who does this and how much $ are we talking to have a pump gas safe head. This is for a GP1300R with 98 hrs, all stock, and compression120-122 all 3 cylinders. Riva heads are expensive, don't know if they are pump gas safe
    To have your stock head milled it's $85 plus shipping.

  4. #4
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by Mike's GPR View Post
    Talk to jims performance in Florida, very affordable. Been running my stock head machined to 150 psi for a few years now.
    Thank you Mike.

  5. #5
    at 150 psi can you still use 87 octane ? not a big issue but nice. what can you mill to and use 91 octane? may try to find a stock head on ebay to send since it would be nice to do the d plate and head at the same time.

  6. #6
    also, do i really need a efi controller when i raise the compression but otherwise do not touch the otherwise stock engine ? one of the stickys says that a controller is necessary when raising compression but i presume that means raising it a lot to where you need to run rich to cool it ? How about aftermarket heads ( like Riva ) ? do they run on pump gas ? just thought i would get as much info as possible.

  7. #7
    Mike's GPR's Avatar
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    Quote Originally Posted by strokersquid View Post
    also, do i really need a efi controller when i raise the compression but otherwise do not touch the otherwise stock engine ? one of the stickys says that a controller is necessary when raising compression but i presume that means raising it a lot to where you need to run rich to cool it ? How about aftermarket heads ( like Riva ) ? do they run on pump gas ? just thought i would get as much info as possible.
    You will need a fuel controller and you should run 91-93 octane

  8. #8
    Quote Originally Posted by Mike's GPR View Post
    You will need a fuel controller and you should run 91-93 octane
    Hi Mike,

    edit...

  9. #9
    Mike's GPR's Avatar
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    Hi Andy!!!

    .

  10. #10
    Hmmmm. not as easy an upgrade as i thought.

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