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  1. #1
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    Clunk under hard acceleration

    Hey guys,


    I'm wondering if any of you have ever had this problem?
    This is on a GTX LTD 255 model.


    When the ski is stationary or idling and full power is given, the ski leaps out like it should but within about 0.5 to 1 second there is a bit of 'clunk' sound that is heard and it is felt by both passenger and operator... It feels like a weight is shifting, but there is nothing in the hull that is bigger enough to shift... It also does this either from reverse to flat out forward or just from idle in forward to flat out in forward.

    The recent changes have been:
    Pump removal
    Wear ring replacement
    Impeller damage repair (While it was in the pump)


    I'm worried it might be bearings in the pump that might have been damaged while damage to the impeller was performed.... Are those bearings very sensitive? I used an open torch, small hammer and stand off behind the impeller. Would they also show those kind of symptoms?


    Other that that the ski goes well, hooks up well and doesn't cavitate.
    It has 50 hours on it.

    I checked the bolts holding the pump in and they are still solid with loctite.

    What could be possibly wrong?

    Could it be just the reverse bucket shifting under pressure?


  2. #2
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Check your motor mounts

  3. #3
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    Thanks, I'll have a look at them first.


    (Off comes the top deck again!)

  4. #4
    If i knew,...I wouldn't ask sea-one's Avatar
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    yup +1

  5. #5
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    Quote Originally Posted by sea-one View Post
    yup +1

    Cool, thanks...

    So where abouts do they normally get shagged?
    Does the rubber section usually crack or does the rubber get dis-joined from the metal bracket of the mount? By rocking the motor side to side and back to front is it easy to tell?

    Is it usually the front or the sides that go?

    I'm guessing this comes from jumping

  6. #6
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Quote Originally Posted by lolzer View Post
    Cool, thanks...

    So where abouts do they normally get shagged?
    Does the rubber section usually crack or does the rubber get dis-joined from the metal bracket of the mount? By rocking the motor side to side and back to front is it easy to tell?

    Is it usually the front or the sides that go?

    I'm guessing this comes from jumping
    That's normally what happens, and the front mount is the most common. Yes... jumping these 4-tec's doesn't do any good for the mounts!

  7. #7
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    Thanks for the info....

    When I get to it tomorrow morning, I'll post up what I find...

    Something I didn't mention:
    I did however find a M8 x 40 hex screw in the hull just loose on the bottom when I took the topdeck off, I searched everywhere trying to find where it came from...

    I just did a search through the OE catalogue and found that its from one of the engine mount brackets... (went thru the whole thing and thats the only place these screws are used inside the hull)

    I thought I checked mine at the time, but I'm adamant this is the cause of the clunk...

    so at 44 hours, one of the scotch grip engine mount screws looks to have loosened it self... (maybe less)

    I also found one of the pump m8 hex bolts to be fairly loose, undone about 1/2 a turn.... So I went a bit nuts with loctite... Just goes to show what the dealers check at 10 hours....

    I'm so glad I've started tinkering, otherwise something may have seriously gone wrong on the water...

  8. #8
    KC Blue Thunder's Avatar
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    Are we talking about a GTX-LTD IS model here 'cause you mentioned that you had to take the top off. Curious. Also what damaged the prop.

  9. #9
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    Yeah its iS.

    We had a mega low tide a couple of days ago (lowest in 6 years) and of-course its the day that the mrs was out on the ski...

    We use a ramp in a creek to get to/from the bay....

    On return, the water was only about 1 foot deep in the middle of the creek... Obviously sucked up a stone or something, but I had the ski apart to clean out the cooling system.... There was remnants of wood, cotton and plastic in the tunnel...

  10. #10
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    Checked all the engine mounts, they all look good, still can't find where that bolt comes from, all the engine mount bolts use hex key instead of hex head as per the workshop manual which makes it even more confusing...

    I searched with a mate for about an hour for where this M8 x 40 scotch grip bolt could have come from to no avail... Looks like its a dealer job now...

    We cranked the front engine mount and port side engine mount about 1/4 of a turn, not enough to make us nervous about the mounts either...

    So, still can't figure it out...

    I'm gonna check in water if its the bucket.

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