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  1. #11
    dcuhpw's Avatar
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    [QUOTE=isa alnoaimi;3059191]
    Quote Originally Posted by rcrisafulli View Post
    What water temps do you run in and what octane fuel are you using? A properly tuned and cooled motor should not crack the head at the Stage 1 level.

    Did you use head studs when your replaced the head?


    riva ARP head studs when i installed the second head , water temps are not hot at all (data logs )

    I think he’s asking what temperature the water is where you go riding not what temperature the water is in your engine While running. I’m guessing he’s thinking thermal shock being a possibility. I’ve noticed this happen on a couple of skis when it is ridden hard and shutoff quick. If there isn’t a “cool down” period and you start it back up when hot, if the water is too cold it could cause thermal shock and crack the head. Heard of this on some older Kawis riding in cold water.


  2. #12
    isa alnoaimi's Avatar
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    ski has fizzle cooler (dedicated line)
    riva cooling kit with (anode)

    you can see engine temp & mat .
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  3. #13
    i been told to say away from the arp head studs

  4. #14
    isa alnoaimi's Avatar
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    Quote Originally Posted by yellow jacket View Post
    i been told to say away from the arp head studs
    brother

    i have used ARP head studs before with 25 psi of boost on FX SHO 2009

    never got any issues with head cracking .

    the casting of the new SVHO cylinder head is not good at all .

    i have 3 friends GP1800 2017 and 2018

    all of them cracked their heads with OEM studs .

  5. #15
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    Same place mine cracked on a 2013 model. No mods. 2 cracks under 1 bung.
    Quote Originally Posted by SplishSplash View Post
    With regards to heads cracking and people with experiance with them. I Just have a question. Are the Core plugs screwed into the head between the sparkplug holes Steel or Aluminum?
    If the are steel, real easy to tell with a magnet, That may be the cause of heads cracking.
    Back in the day, a 16 valve head (aluminum) made by Lotus, has similar cracking issues, turns out they put steel core plug screws in the head and they expanded at different rates than the aluminum casting, causing head stress and cracking over time.
    This caused oil and coolant mxing, oil leaks, collant leaks etc.

    May be worth a look and see. and if steel, someone should manufacture some aluminum ones to stop the head stress.

  6. #16
    isa alnoaimi's Avatar
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    any 2019-2020 heads cracking ?

    whats the solution with these heads seriously ???

    yamaha really needs to address this issue !!!

  7. #17
    isa alnoaimi's Avatar
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    im gonna get me rxp-x

    whats there known problems ?
    Last edited by isa alnoaimi; 02-07-2020 at 10:23 AM. Reason: spell

  8. #18
    isa alnoaimi's Avatar
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    can this oil cooler cause water mixed with oil in the engine ?

    my fzr svho is 2016 model , and this cooler is on my engine .
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  9. #19
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by isa alnoaimi View Post


    can this oil cooler cause water mixed with oil in the engine ?

    my fzr svho is 2016 model , and this cooler is on my engine .
    That is the 'stacked plate' design, which is known to fail.

    Before the stacked plate type Yamaha had a different oil cooler which worked well. Circa 2017 Yamaha went back to the earlier type and continues to use it on current SVHO models.

    Are you seeing an oily sheen on the water around the hull when idling?

  10. #20
    isa alnoaimi's Avatar
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    Quote Originally Posted by K447 View Post
    That is the 'stacked plate' design, which is known to fail.

    Before the stacked plate type Yamaha had a different oil cooler which worked well. Circa 2017 Yamaha went back to the earlier type and continues to use it on current SVHO models.

    Are you seeing an oily sheen on the water around the hull when idling?
    no its not leaking oil out of the pisser , if the oil cooler is bad can it mix oil and water in the engine ?

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