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  1. #1

    Piston smashed the valves?reasons?

    I saw many blown engine coz of that...I even saw that on stage 1 boats

    Sea doo valvetrain not that good or what?


  2. #2
    Site Admin Green Hulk's Avatar
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    The 04-05 skis were known for having weak exhaust valves. They break off and cause damage.

    Valve float can also cause damage. Running an aftermarket ECU with stock valve train is a cause. When running a higher rev limit you must upgrade your valve train to handle the higher RPM.

  3. #3
    Enufpwr's Avatar
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    I read a post where Nils had a good explanation on valve failure to add to Jerry's.

    here it is....
    http://greenhulk.net/forums/showpost...32&postcount=3

    Quote Originally Posted by Nils888 View Post
    I love the way every one points the finger at the valve being bad.

    I have seen every manufacture of valves break. Including stock.

    What most people fail to take into consideration is. WHY DID THE VALVE BREAK!!!

    From my experience. Most of the valve failure I have seen in seadoo is from running lean and over heating the exhaust valve witch results in valve stem expanding and sticking in the valve guide and getting hit by the piston.

    Another cause is from low valve spring pressure. This causes Valve float or bounce at high RPM. Plus running lean. The valve dose not have a chance.

    Almost all of the valve failure I have seen has been an exsaust valve.


    And the third reason for the valve failure is!!! Camshaft timing set incorrectly Yes I have see this many times!!!!

  4. #4
    Quote Originally Posted by Enufpwr View Post
    I read a post where Nils had a good explanation on valve failure to add to Jerry's.

    here it is....
    http://greenhulk.net/forums/showpost...32&postcount=3
    Great post! Good info right there.

  5. #5
    Quote Originally Posted by Green Hulk View Post
    The 04-05 skis were known for having weak exhaust valves. They break off and cause damage.

    Valve float can also cause damage. Running an aftermarket ECU with stock valve train is a cause. When running a higher rev limit you must upgrade your valve train to handle the higher RPM.
    Can too much black carbon on the valvetrain ( from ranning too rich ) cause that issue also?? if yes ...How we can clean the vaveltrain without take off teh head????

    Any thread here let u sknow how we can maintenance our boat?

  6. #6
    Quote Originally Posted by enufpwr View Post
    i read a post where nils had a good explanation on valve failure to add to jerry's.

    Here it is....
    http://greenhulk.net/forums/showpost...32&postcount=3
    great post!!!!

  7. #7

    valves

    So what was the cause for failure, what repairs were done?

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