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  1. #1
    There is no VooDoo like BadVooDoo NeVerMind's Avatar
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    Gasket Layer Removal

    I am running a 2001 GPR with R&D 41cc heads..

    How many layers of gasket can I remove and keep it running with 93 octane?

    I have a girlded head.


  2. #2
    Happily Self-Employed WFO's Avatar
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    currently what is you compression?

  3. #3
    canadaxp's Avatar
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    I actually have the same question. I'm at 3100 feet, so can I take off 2 layers without lowering the squish too much?

  4. #4
    ramnj's Avatar
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    I read a thread on the Riva forum about being able to remove 1 layer from the 1200 and 1 layer from the 1300 to bump your compression up and still use 93. You might want to do a 'Find' search on the Riva site.

  5. #5
    Happily Self-Employed WFO's Avatar
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    The squish is the big question. Some people mill heads, some remove layers of gaskets.

    It is not unheard of to run one layer of gasket.

  6. #6
    There is no VooDoo like BadVooDoo NeVerMind's Avatar
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    I don't have an accurate compression reading because all I have right now is a cheap auto gage (broke snap on unit, waiting for guy) I get about 110 across all 3. The motor is 10 hours old.

    Is anyone running a single layer?

  7. #7
    ramnj's Avatar
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    I believe your compression should be in the 140-150PSI range. Are you sure its 110PSI? Stock is in the 125psi range.

  8. #8
    Happily Self-Employed WFO's Avatar
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    Is anyone running a single layer
    I know of 1300s running 1 layer, but we only have 2 layers total. Doesnt the 1200 have 3 layers?

  9. #9
    ramnj's Avatar
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    Quote Originally Posted by WFO
    Is anyone running a single layer
    Doesnt the 1200 have 3 layers?
    The 1200 has 3 layers.

  10. #10
    Mongoose's Avatar
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    The 1300 has 2 layers, and they are both the same.
    The 1200 has three layers, and you should only use the outer layers, not the centre 1. Yes you can run one layer of the 1200 with no problems.
    I had no problems doing it, but some people have had issues with water leaks. Suck it and see, you may be lucky.
    If reliability, or breakdons concern you i.e. no easy tows home, I would mill the head and keep the integrity of the gasket.
    Contrary to popular beleif, Yamaha DO know what they are doing, and spend millions on R&D. If they thought a 1 layer gasket was the way to go, they would come from Japan that way.

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