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  1. #1
    I dream skis
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    R&D head sealing issue

    I have a R&D head o-ring style 750/800 27cc domes. I took off the head to see if the head was sealing both combustion chamber and water cooling. I used 1211 sealant around the head with the o-rings. O-rings sealed the combustion chamber fine but the 1211 sealant never contacted the cylinder deck. Had I ran water through it it would have leaked out of the head reducing cooling to the pipe.

    My question is can I run a oem metal gasket instead of using the o-rings. I think this will lower compression but at 27cc I can handle a reduction in compression. Will I loose sealing properties specifically with the combustion chamber allowing water into cylinders?


    What are your thoughts?
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  2. #2
    I dream skis
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    Re: R&D head sealing issue

    I bought the o-rings from R&D. Could they be to big in diameter to allow the cooling portions of the head to contact the deck properly?

    Right now the R&D head is not torgued down enough so I am losing compression as is with the orings.
    Last edited by River Rat; 08-05-2017 at 02:21 PM.
    SeaDoo Hx
    Kawi 750 sx
    Kawi 550

  3. #3
    Top Dog Benflynn's Avatar
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    Re: R&D head sealing issue

    We have a yammy rd rec head, it sealed up fine, we ordered both of the std orings from McMaster Carr, one size fit well. No hg

  4. #4
    PWCToday.com Is My Home Away From Home Rushford_Ripper's Avatar
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    Re: R&D head sealing issue

    You shouldn't need to use sealant, find some marine grease and when installing the O-rings, use a little to seal the ring into the head as it will also help keep it in there while installing.
    Last edited by Rushford_Ripper; 08-24-2017 at 01:35 PM.


  5. #5
    PWCToday.com Is My Home Away From Home Chester's Avatar
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    Re: R&D head sealing issue

    The 750 R&D head must use sealant as it only has o-rings around the combustion chambers.

    Chester
    Speed is very expensive. How fast do you want to spend?

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  6. #6
    Top Dog
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    Re: R&D head sealing issue

    ^^x2 and the head surface is slightly convex to compress more around the combustion chamber so r&d uses 1211 to seal the cooling portion.

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