Rogo head.yamaha 650. Compression questions
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  1. #1
    PWCToday.com Is My Home Away From Home jdpilot's Avatar
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    Rogo head.yamaha 650. Compression questions

    Installed a rogo head (attached pic) on a 92 waverunner 3 650. Seller said it was on his 650 super jet and it gave him 185psi.
    I had 145psi on this waverunner. Test run today. I'm at 205psi!?!!??!

    Fortunately I'm running avgas so I'm not super worried, but still, seems high for a rogo 650 head on a 650. I have an Sbt head gasket in her. Should I go thicker or double up?


    Prospect Mountain Powersports
    Altitude; 653
    Limited 87 650SX- 43.6
    Limited 93 X2- 45.1
    Limited 87 hull/86 internals X2- 43.7
    92 WR3- 37.0
    93 WR3 w/Shuttlecraft JetSport
    94 WB1- Limited
    09 superjet- stock 1 owner
    88 WetJet 432- stock 1 owner
    87 X2- stock 1 owner
    82 js440- stock 1 owner
    92 js440- stock 1 owner
    85 js550- stock 1 owner
    85 js440 super stock- Expert Womens Class
    85 js440- super stock- Region 8 Novice

  2. #2
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Rogo head.yamaha 650. Compression questions

    Is it a fiber gasket or metal?
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  3. #3
    PWCToday.com Is My Home Away From Home jdpilot's Avatar
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    Re: Rogo head.yamaha 650. Compression questions

    Quote Originally Posted by Myself View Post
    Is it a fiber gasket or metal?
    metal. from.sbt..supposed to be oem standards.

    Prospect Mountain Powersports
    Altitude; 653
    Limited 87 650SX- 43.6
    Limited 93 X2- 45.1
    Limited 87 hull/86 internals X2- 43.7
    92 WR3- 37.0
    93 WR3 w/Shuttlecraft JetSport
    94 WB1- Limited
    09 superjet- stock 1 owner
    88 WetJet 432- stock 1 owner
    87 X2- stock 1 owner
    82 js440- stock 1 owner
    92 js440- stock 1 owner
    85 js550- stock 1 owner
    85 js440 super stock- Expert Womens Class
    85 js440- super stock- Region 8 Novice

  4. #4
    PWCToday.com Is My Home Away From Home Myself's Avatar
    Join Date
    Jun 2006
    Location
    Arkansas
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    41
    Posts
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    Re: Rogo head.yamaha 650. Compression questions

    Well, that can't be right cause all the 650 and older 701 came with a thick fiber gasket. I've never taken an original apart yet that had metal. I'm guessing a fiber gasket will get you to 170-180psi.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

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