Opinion Needed: Are these cynlinders usable? JS550
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  1. #1
    PWCToday Newbie
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    Opinion Needed: Are these cynlinders usable? JS550

    Looking for advice on whether these cylinders are usable. They are for a JS550 and are marked 530A on the side. The cylinder walls are in good condition, I cannot find any marks that catch your fingernail. Crank side mating surface is good, my concern is the head mating surface, there are some dark areas I have not been able to clean. Also there is a small crack on
    one of the stud mounting holes on the intake manifold. Thanks in advance.

    20180828_154805.jpg20180828_154743.jpg

  2. #2
    PWCToday Newbie
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    Re: Opinion Needed: Are these cynlinders usable? JS550

    You can always resort to 600# wet/dry sandpaper, or pull the studs on the cylinder & have a machine shop do a light cut on the cylinder top.
    The crack is not important, the torque on those bolts is low, just remember to run the proper upper carb support bracket to brace it.
    Once snapped a Mikuni SBN 44 at one of the bolt ears trying that. Don't try running bracketless. : ( no bueno.

  3. #3
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    Re: Opinion Needed: Are these cynlinders usable? JS550

    head gasket surface is usable.worst case you resurface it a bit.
    make sure crack doesn't reach into water jacket and keep an eye on it.the battery ground stud goes there so don't tighten it too much into the cylinder and you'll be fine.

  4. #4
    PWCToday Newbie
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    Re: Opinion Needed: Are these cynlinders usable? JS550

    Quote Originally Posted by pepper22 View Post
    You can always resort to 600# wet/dry sandpaper, or pull the studs on the cylinder & have a machine shop do a light cut on the cylinder top.
    The crack is not important, the torque on those bolts is low, just remember to run the proper upper carb support bracket to brace it.
    Once snapped a Mikuni SBN 44 at one of the bolt ears trying that. Don't try running bracketless. : ( no bueno.
    Also, can someone explain what the black marks are? Some of the head surface cleans up nicely but where it has turned dark it is about impossible to get cleaned.

  5. #5
    PWCToday Newbie
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    Re: Opinion Needed: Are these cynlinders usable? JS550

    All a search says about black rust is that it forms in low-oxygen & water environments.....not unheard of for 550 jet ski parts.
    It also is supposed to be a 'better' oxidation process than the dreaded red sort. If the surface is stable & you don't catch a finger nail
    on it, & you happen to run a stock (thick) head gasket, the multi-layer ones tend to tolerate slight surface irregularities.
    I've never seen black rust on a 550 iron cylinder, have no experience with it.

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