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  1. #1
    SideFX's Avatar
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    Question Engine damage. How bad? (images attached)

    How gone is this?

    1) No doubt the rings broke on the PTO side which caused the damage to the dome and the piston.
    Q: can I still use the head or does it have to be replaced?

    2) Not sure where the scratches come from which can be seen on both piston skirts. Was this a result of the rings from the one side travelling through the crank case, or is it normal??
    And since there is obvious indication of fragmentation of piston and rings, is the lower end still salvageable, or does it need to be replaced?

    3) The rotary valve plate surface shows marks which look like a gouge. It's not deep at all, just looks to be that way.
    Q: How critical is that face? Does it need to be absolutely smooth?

    4) Should I replace the motor, or rebuild?

    5) Is SBT a good choice?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #2
    SideFX's Avatar
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    more images
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  3. #3
    flyin' the friendly skies airbornexp's Avatar
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    man thats pretty bad. as for the head you have some burrs that could cause problems. Id almost trash the head. the piston is shot. and I think that I would get a new RV cover as it is scored pretty good. Im also wondering where the rest of that piston is...

  4. #4
    96XPSS's Avatar
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    Since it did damage to both pistons I'm guessing the manifold to headpipe gasket failed, allowing water to be injected into the cylinders. The erosion/failure of the PTO piston is from water.

    Most cranks live in 800 engines when this occurs. You will probably need to bore. I'm not sure on the head, it isn't too damaged. You will lose some performance if you choose to remove the high spots and reuse.

    The RV surface should be ok too.

  5. #5
    SideFX's Avatar
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    Man to head gask was in good condition upon taredown.
    Needle wasn't seating properly in PTO carb, thus filled the cylinder.
    Had no idea it was packed, then hit the start switch.
    Is there a good way to fish out debris? Cuz me not sure where the scraps have all gone Blew out through the exhaust? In water box? In lake? LoL

    Trying to find the best solution, cost effective if possible, however here are some prices I received on a reman.

    Dealer (local):
    $1,600.00 for BRP short block (that is with a core return) Otherwise $2,477.99 w/o

    Called SBT (the blown motor is an SBT, 2007)
    $845.00 with core returned. $285.00 shipping to Clear Water, $285.00 shipping to BC.
    Total $1,425.00 (plus duty/taxes/brokerage/hamburger/fries/gravy) so could end up being close to the above 1.6k

    I'm not sure which would be the better bang for the buck since end costs will be very close. Go SBT or the BRP OEM?
    And will probably have to fish for a new head as well since the domes don't look to be interchangeable.




    Quote Originally Posted by 96XPSS View Post
    Since it did damage to both pistons I'm guessing the manifold to headpipe gasket failed, allowing water to be injected into the cylinders. The erosion/failure of the PTO piston is from water.

    Most cranks live in 800 engines when this occurs. You will probably need to bore. I'm not sure on the head, it isn't too damaged. You will lose some performance if you choose to remove the high spots and reuse.

    The RV surface should be ok too.

  6. #6
    This is how I run a jetski shop in the desert nmpeter's Avatar
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    what's the two year warranty worth to you?

    all said an done, a brandy new seadoo motor is sweet..but balance that against the SBT warranty + potential bum motor+ possible core charges on the head damage ( shipping is a serious issue for you).

    then figure out why she actually blew up....

  7. #7
    96XPSS's Avatar
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    Glad you told me what caused it. Excess fuel will cause it to seize too.

    I'd find a core and go Rotax reman over SBT anytime.

    You can split the cases if you want to doo it right. Most of the debris already went out the exhaust though.

  8. #8
    SideFX's Avatar
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    I wouldn't bother splitting the case at this point and will take your asdvice.
    Block is sound, so should get the 700. rebate.
    Should I go for a stock head? New? Used?


    Quote Originally Posted by 96XPSS View Post
    Glad you told me what caused it. Excess fuel will cause it to seize too.

    I'd find a core and go Rotax reman over SBT anytime.

    You can split the cases if you want to doo it right. Most of the debris already went out the exhaust though.

  9. #9
    96XPSS's Avatar
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    Stock or and R&D rec head, 43cc domes. It looks and bolts on just like the stocker, using the stock headshell.

  10. #10
    SideFX's Avatar
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    Re: R&D rec head. What will this raise compression by?
    Is it safe to use with a new motor, and, will it void warranty?

    Will I have to do any other mods if running this head over stock?

    I've heard of a shell-head, LoL, but what is a headshell?


    Quote Originally Posted by 96XPSS View Post
    Stock or and R&D rec head, 43cc domes. It looks and bolts on just like the stocker, using the stock headshell.

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