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  1. #1

    Join Date
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    problem with blown head gasket

    hi guys
    my ski
    2007 rxt 215
    stage 3 riva
    et137+4
    ecu riva 8600rpm
    valve train kit
    50lbs injector bush
    fuel regulator
    free flow exhaust
    riva gen 3 intercooler
    sponson
    riva grate
    solas 15 20r
    riva thermostate
    exhaust spacer
    etc ..

    -wather temperature here is 10-25 degree in the summer

    last year i blown my head gasket ans i resurface the head and this year with a 8 degree wather i blown my second head gasket

    two riva head gasket
    when i resurface the head we remove 8\1000

    a guy i know said to me when you remove more than a 4\1000 on a brp its scrap

    need input because i love my ski and i dont whant to change

    i know some guys are going to say install a open loop but here in canada the wather its fucking cold compare to some guys in the south of america

    sorry for my english guys
    im french


  2. #2
    Moderator Snoman's Avatar
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    What did you torque the head to when installing???Did you re-use the old head bolts or install new ones,OR did you use studes??IF you used studs did you re-torque them after you ran it through a couple heat cycles????Did you check the decking on the block also??

  3. #3
    krouchchocolate's Avatar
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    Have you tried using a OEM head gasket instead of the Riva? Seems like a lot of people on this forum have more luck with the OEM vs. the Riva

  4. +1 by:


  5. #4

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    i did not check the block

    i use brand new oem bolt every time and i do the brp torque
    angle torque

  6. #5

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    how close are you to the 8600 rpm rev limit?

  7. #6

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    Quote Originally Posted by jim View Post
    how close are you to the 8600 rpm rev limit?
    Max throttle
    8600rpm

    What is the best torque for the head Bolt?

  8. #7

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    Quote Originally Posted by philon18 View Post
    Quote Originally Posted by jim View Post
    how close are you to the 8600 rpm rev limit?
    Max throttle
    8600rpm

    What is the best torque for the head Bolt?
    How much can you remove from the head

    Some said max 4/1000 max After that is scrap

    What is the best for head torque with angle or regular torque

  9. #8
    Moderator Snoman's Avatar
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    Quote Originally Posted by philon18 View Post
    Quote Originally Posted by philon18 View Post
    Quote Originally Posted by jim View Post
    how close are you to the 8600 rpm rev limit?
    Max throttle
    8600rpm

    What is the best torque for the head Bolt?
    How much can you remove from the head

    Some said max 4/1000 max After that is scrap

    What is the best for head torque with angle or regular torque
    As Jim had brought up,Your all over the rev limiter..Back it off to 8500 and that should help your head gasket issue....As far as torque rating..The manual is low IMO...I use studs in mine and torque them to 92 ft lbs..IF i read the manula right it says to torque the head screws to 40 NM/30 ft lbs then tighten then another 120 degrees with a finishing 90 degrees after...thats way to low IMO...I know back in the day guys were blowing head gaskets and were just torquing the head down to 85-90 ft lbs even on just the OEM stretch bolts and that helped end thier head gasket issue..I know this isnt the right way BUT thats what they were doing....BUT seeing your all over the limiter this.IMO is the major issue why your popping them..second,low head bolt torque....Compine the 2 and youll blow them every time..

  10. +1 by:


  11. #9

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    How the head gasket survive when the guys have a8900rpm limit
    When i have a stock sky i was always full throttle and no blown head gasket
    The Bolt are strong enough for 90ft lbs

    Why riva made ŕ 8650rpm limit and we can not go there




    Quote Originally Posted by Snoman View Post
    Quote Originally Posted by philon18 View Post
    Quote Originally Posted by philon18 View Post
    Quote Originally Posted by jim View Post
    how close are you to the 8600 rpm rev limit?
    Max throttle
    8600rpm

    What is the best torque for the head Bolt?
    How much can you remove from the head

    Some said max 4/1000 max After that is scrap

    What is the best for head torque with angle or regular torque
    As Jim had brought up,Your all over the rev limiter..Back it off to 8500 and that should help your head gasket issue....As far as torque rating..The manual is low IMO...I use studs in mine and torque them to 92 ft lbs..IF i read the manula right it says to torque the head screws to 40 NM/30 ft lbs then tighten then another 120 degrees with a finishing 90 degrees after...thats way to low IMO...I know back in the day guys were blowing head gaskets and were just torquing the head down to 85-90 ft lbs even on just the OEM stretch bolts and that helped end thier head gasket issue..I know this isnt the right way BUT thats what they were doing....BUT seeing your all over the limiter this.IMO is the major issue why your popping them..second,low head bolt torque....Compine the 2 and youll blow them every time..

  12. #10
    Moderator Snoman's Avatar
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    Cause with a stock ski Sea-Doo keeps the prop almost 200 RPM off the limiter...It also has a conservative fuel and timing curve compaired to the aftermarket ECUS..

    With the Riva it has a rev Limiter of 8600,were as you start to lose timing and fuel at that RPM...Thats why it is suggested that you set your RPMs to 8500 when running that ECU...

    Guys that are running 8900 plus have their ECU rev limiters set up for a 9200 or higher rev limiter....this way they can run them RPMs with out having to worry about this..

    The bolts can handle it BUT i dont think i would push the stretch bolts that hard...do a search and see what others are setting them to maybe this can halep you some....

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