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  1. #1
    Cliffy's Avatar
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    Loosing The Will To Live

    Guys

    Im now at the wits end of owning my ski

    Ive melted another piston this weekend this time the middle one, going along 45mph on the screen going great guns and then it dieded, just suddenly died with no warning it just cut out

    Got it back to sure checked the cylinders and ive now found the centre piston has melted, ive caught it earlier than the first one, and both rings are intact

    What would of caused it to happen this time?

    One person suggested its because the new cylinder and piston was creating a 150 compression and the 135 out of the rear 2 cylinders

    Im really tempted to throw the towl in, im guessing im gonna need new gasket set again for the zaust manifold etc as well as the cylinder heads

    What would be causing this, i could understand if it was the same piston/ cylinder but its not, could it be the premixer system?? does the oil feed go to each carb seperately??

    Im really tempted just to get a waveruner fxho and call it a day with this ski

    Neil


  2. #2
    ryandi2's Avatar
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    hang in there man!

    dont throw in the towel yet.

    questions to ask you

    1. did you take all the cylinders off?

    2. did you reuse gaskets?

    3. did you take the carb s off?

    4. have you rolled the ski over before or after the first piston blow?\

    5. do you flush the system after every salt ride?

    6. can you post pics?

  3. #3
    TopCop931's Avatar
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    Don't quit yet Neil. Read my threads and you will feel better. I was talking to someone that said he melted a piston on his SLT750 because it wasn't getting oil. I haven't really gotten into the oil delivery in these yet other than the basic understanding of how it works. I do remember reading somewhere that the control rod on the oil pumps tend to bend a bit over time and cause problems with oil delivery. The rod has to be at 6 7/8". You can check it by holding the throttle wide open and see if index marks align on the control lever and the pump. If this were your problem I think you would have problems on all cylinders but with these things who knows. I would think the lines could have problems just as the fuel lines.

    These guys should have some answers for you. You have 6 questions to answer already.

    Good Luck Buddy.

  4. #4
    bowsniper's Avatar
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    if you have your oiling system on, it will dispense oil low in the carb for each one.. if you go premix,its always there no matter what. unless of course, you forget one time to add oil and blow the motor up. sorry to hear your having trouble.. its a nice ski, id fix it.

  5. #5
    Cliffy's Avatar
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    Cheers guys, its just really gutty

    Quote Originally Posted by ryandi2 View Post
    hang in there man!

    dint throw in the towel yet.

    questions to ask you

    1. did you take all the cylinders off?

    2. did you reuse gaskets?

    3. did you take the carb s off?

    4. have you rolled the ski over before or after the first piston blow?\

    5. do you flush the system after every salt ride?

    6. can you post pics?
    The answers to the above

    1. No removed only the front one but removed all cylinder heads

    2. New gaskets used

    3. Didnt remove the carbs

    4. No

    5. The minute the ski comes out of the sea its flushed eveytime

    6. I will take another pic but look very similar to the first one that went which is here



    thanks
    Neil

  6. #6
    ryandi2's Avatar
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    pop the heads back on and check index the red neck way.. and go threw your carbs again.. your sure your fuel pump is 100% mint

    did you use any gasket sealer?

    when you put the engine back together do a leak down test..

  7. #7
    Cliffy's Avatar
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    Quote Originally Posted by ryandi2 View Post
    pop the heads back on and check index the red neck way.. and go threw your carbs again.. your sure your fuel pump is 100% mint

    did you use any gasket sealer?

    when you put the engine back together do a leak down test..

    What do u mean by the pop heads on and test red neck way, what do i need to do

    Ill go through the carbs again although this time its the centre one not the front, would carb sync cause this??

    How do u perform a leak down test?

    thanks
    Neil

  8. #8
    Cliffy's Avatar
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    Also would compression being different between the pistions be a issue??

  9. #9
    Cliffy's Avatar
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    Think ive solved it, one of the bolts wernt down properly on the centre pistion the one under the water rail, i can also see gas damage to the piston, according to the burn down basic's this could of cause it right??

  10. #10
    ryandi2's Avatar
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    it could.. but its hard to tell.. from what your describing.. the head bolt was loose?

    when i say check for crank index.. put the center piston at top dead center.. and then put all the piston heads on ... then take a pencil (eraser end) and stick it in the pto cyl and mark where the top of the hole is on the pencil.. then move to the mag and if that line does not match the pto then your crank is out of index and you will have to pull the crank.. but do some more reading on this..

    to be honest idk if compression being off like that would mess anything up.. if it was way off maybe.. what where the reading again?


    what do the other pistons look like? (piston tops)

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