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  1. #1
    LindenPWC's Avatar
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    ultra 300X Cracked Cylinder Head

    I have noticed a crack in my 300X cylinder head. i want to know if this can be repaired or if it can cause further damage? i haven't notice any performance issues and don't want to put it back together without addressing it?? what do you think????
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    Last edited by LindenPWC; 04-14-2017 at 03:05 PM.


  2. #2

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    With all the corrosion present in that one cylinder I'd also look into why there was some possible water ingestion. And IMO you are looking at a new head and valves. No way you could just throw it back together and expect things not to fall apart onto itself. What does the piston look like?

  3. #3

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    If you're planning on getting a new one ill take that one.....

    That being said most every head i took apart has those tiny cracks. If the crack is just surface and doesnt extend past the valve seat i would worry about it. Valves on the other hand are hammered, once you clean them up i bet the pitting you see will be much worse.

  4. #4

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    I see two cracks. That can be fixed. I hooked up with a local shop that I tig some cracks for him and he redoes the heads. He preps them for me too. I am talking automotive heads. I asked him if he had done jet ski heads and he said yes.

  5. #5
    LindenPWC's Avatar
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    Quote Originally Posted by Rescue1 View Post
    With all the corrosion present in that one cylinder I'd also look into why there was some possible water ingestion. And IMO you are looking at a new head and valves. No way you could just throw it back together and expect things not to fall apart onto itself. What does the piston look like?
    I didn't notice anything real abnormal with the pistons. i will be replacing the pistons and the head crack seems to be surface crack. no damage to the valve seats. i believe the valve corrosion came from the previous owners left the ski in the saltwater all year. what can cause water ingestion? I'm not the original owner but the ski ran fine last week when it was tested. when i took the head apart it seems like the head gasket may have leaked at one point? i found a lot of silicone on the head gasket.

  6. #6
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    Quote Originally Posted by TJS0712F View Post
    I see two cracks. That can be fixed. I hooked up with a local shop that I tig some cracks for him and he redoes the heads. He preps them for me too. I am talking automotive heads. I asked him if he had done jet ski heads and he said yes.
    yes there are 2 cracks. pm me the contact info for the shop. Thanks!

  7. #7
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    Quote Originally Posted by MWHC View Post
    If you're planning on getting a new one ill take that one.....

    That being said most every head i took apart has those tiny cracks. If the crack is just surface and doesnt extend past the valve seat i would worry about it. Valves on the other hand are hammered, once you clean them up i bet the pitting you see will be much worse.
    have you noticed any issues in this location where the cracks are? and what causes these cracks? it seems to be surface cracks??

  8. #8
    LindenPWC's Avatar
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    Quote Originally Posted by Rescue1 View Post
    With all the corrosion present in that one cylinder I'd also look into why there was some possible water ingestion. And IMO you are looking at a new head and valves. No way you could just throw it back together and expect things not to fall apart onto itself. What does the piston look like?
    Pistons
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  9. #9
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    That head looks rough, sure that's corrosion and not detonation in that one cylinder?

    Both head and valves are badly pitted.

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  11. #10
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    Let's see close ups of the piston from that one cylinder.

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