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  1. #1
    GPR1200_syd's Avatar
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    If 1200 Cyl are machined to 1300 do i need a 1300 head ??

    Hi guys,

    I was looking at honing my 1200 cylinders to 1300 cylinders, my only concern is with the head, is it just a simple matter of getting the domes machined larger on the head to match or will i need a 1300 head, any help would be appreciated.


  2. #2
    spud's Avatar
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    No get the 1200 head machined to a 1300 as well. I have heard of people using OEM 1300 heads on 1200 cylinders. I haven't tried it. I do use 1300 head gaskets. Its not a perfect fit but it works.

  3. #3
    GPR1200_syd's Avatar
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    Someone had told me once that the water passages don't line up when you put a 1300 head on 1200 cylinders, how true is that ?

  4. #4
    spud's Avatar
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    They dont line up perfectly. That is true. The 1300 heads have the anodes in them while the 1200 cylinders have the anodes in them. They line up good enough to let the water that passes through the tiny holes in the gasket pass through.

    The 1300 head must be cheaper for Yamaha to manufacture than the 1200 head. Its also a little lacking in the looks department with the exhaust mounts sticking up so far.

  5. #5
    Caution raider fan in the area !!
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    Smile fan

    hey , spud big fan of you .

  6. #6
    Hydrotherapy's Avatar
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    spud,

    hi mate the 1300 have the anodes in the jugs,put me right if wrong cos if `your right you will piss on my next project spud can i be a fan too looks like your butts out on loan

  7. #7
    Moderator RX951's Avatar
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    Quote Originally Posted by rddrkv View Post
    hey , spud big fan of you .
    autographs ?
    rookie cards ?

  8. #8
    Moderator Insanediego Joe's Avatar
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    Spud, can I get a signed picture of you?

  9. #9
    spud's Avatar
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    rddrkv

    Thank you for the kind words. I certainly don't consider myself in that crowd.


    Joe,

    Either one of You or Billie know more about this stuff than I do.

    It must just be my Kamikaze superman ride on the Avatar.

    If you go to the parts finder and look at the head you will see the anodes (#7) going to the head. Hate to piss on your project. Is it 1300 cylinders and a 1200 head and you ride in salt water?

    As far as the Guru's go:

    You have Hydrotoys who will eventually be faster than the two strokes due to sheer horsepower and determination. Who is your friend and will always give very good advice.

    Kerry who has always been the fastest

    Ben who isn't trailing Kerry by much

    Fercho who is your friend and will help you to 80

    Lowell Horning who is your friend and does the best engine work I have ever seen.

    Harry Klemm who builds reliable good packages for rec riders and grudge racers alike

    Tim Judge who still has the world speed record and has many championships under his belt

    Tommy Jordan, Who makes things go fast with lower horsepower engines.

    And a whole list of others who aren't as well known.



    I'd probably give myself a "B". The aforementioned folks are all strong "A"'s ruining the bell curve for the rest of us students.

    Salty,

    Best of luck with your project.

    Happy Thanksgiving Everyone

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