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  1. #1
    ....back from the dead.... J-ME's Avatar
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    Big bore head gaskets

    Those of you who are running over 1300cc, what are you using for head gaskets?


  2. #2
    2000 GPRXP 4tec shooter98xpl's Avatar
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    if you want a gasket made just call up cometix or something like that, they make any gasket you want to any thickness you want..
    SHOOTER

  3. #3
    ....back from the dead.... J-ME's Avatar
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    Thanks Shooter. Good to know info. I have used Cometic gaskets in the past with zero problems.

  4. #4
    Moderator RX951's Avatar
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    Lightbulb custom head gaskets

    Here is some information for future reference if anyone does a search

    http://www.cometic.com/




    Cometic Gasket, Inc.
    8090 Auburn Road
    Concord, OH 44077
    (800) 752-9850Call Toll Free
    (440) 354-0777Order / Tech Line
    (440) 354-0350Fax

  5. #5
    Moderator RX951's Avatar
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    Harry Klemm at GroupK also sells the 1390 head gasket.

  6. #6
    HopatcongGPR's Avatar
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    use a stock gasket opened up with a sanding wheel/drum. start with a 50-80 grit to rough opening, then 120 grit to fine tune the opening.

    on the standard gasket there is fabrication rings in the teflon coating that can be used as guides (very slight marks that can be seen close up)

    1200 gasket is good to 87mm

    1300 gasket is good to anything that is currently available to the general public.

    if you needed to use a single shim to obtain the correct squish i would use a 1300 gasket as a single shim on 1200 OR 1300 cylinders. over 87mm you need to use both 1300 shims to seal properly.

    use the gaskets dry as they come from yamaha.

    DO NOT RE-USE THESE GASKETS. it is a one time use only.

  7. #7
    I know the water jacket is a little differant - but a lot of us have gotten by just fine using OEM 1300 gaskets on 1200 bored cylinders for a long time now (3+ years).

  8. #8
    Me Hahn and Joe H204YOU's Avatar
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    Quote Originally Posted by HopatcongGPR View Post
    use a stock gasket opened up with a sanding wheel/drum. start with a 50-80 grit to rough opening, then 120 grit to fine tune the opening.

    on the standard gasket there is fabrication rings in the teflon coating that can be used as guides (very slight marks that can be seen close up)

    use the gaskets dry as they come from yamaha.

    DO NOT RE-USE THESE GASKETS. it is a one time use only.
    Dan,dont forget to warn about grinding too fast and melting the teflon off the mateing surfaces Damn elephants

  9. #9
    cheatin' piston popper addicted's Avatar
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    Wait a second!
    J-me, youre running over 1300cc's and you wanted to race my little old raider this past weekend?

  10. #10
    ....back from the dead.... J-ME's Avatar
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    I am not running a BB 65U, however I have a set of cylinders that can go to 87+. Finding off the shelf pistons is going to be a problem though.

    BTW, nice numbers last weekend!

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