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  1. #1
    driveumhard's Avatar
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    Reliability of the STX F12?

    I found a 2007 STX F12 with only 29 hours. I have never owned a Kawi so I just have a few questions for the experts on here....

    1) How reliable is this ski?
    2) GPS top speed?
    3) How stable is this ski for 2 riders?

    THANK YOU for all helpful comments!!
    Last edited by driveumhard; 01-17-2014 at 10:58 AM. Reason: sp


  2. #2
    Quote Originally Posted by driveumhard View Post
    1) How reliable is this ski?
    2007 is the last production year of 12F (since 2003) and it would be the most reliable model year with the updated ECU. Some earlier year models suffered piston damage due to detonation in "certain" condition (low octane in dry hot weather). Just do the jet pump bearing check/replacement if you get it.


    Quote Originally Posted by driveumhard View Post
    2) GPS top speed?
    56-57 MPH (depending on total weight, fuel & people)


    Quote Originally Posted by driveumhard View Post
    3) How stable is this ski for 2 riders?
    It's a fed certificed 3-seater ski. Stability would be about average for its class. But it's like riding a bicycle. You need to counterbalance espeically in low speed manuvering. And again just like bicycle, faster you go, more stable it is.
    Last edited by meangreenman; 01-17-2014 at 12:04 PM.

  3. #3
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    250 hours on my 2004 12f with no issues.

    Sean

  4. #4
    driveumhard's Avatar
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    Is the jetpump bearing a pain to check? I'm guessing you need to pull the pump?? Thanks!!


    QUOTE=meangreenman;2317773]
    Quote Originally Posted by driveumhard View Post
    1) How reliable is this ski?
    2007 is the last production year of 12F (since 2003) and it would be the most reliable model year with the updated ECU. Some earlier year models suffered piston damage due to detonation in "certain" condition (low octane in dry hot weather). Just do the jet pump bearing check/replacement if you get it.

    Quote Originally Posted by driveumhard View Post
    2) GPS top speed?
    56-57 MPH (depending on total weight, fuel & people)


    Quote Originally Posted by driveumhard View Post
    3) How stable is this ski for 2 riders?
    It's a fed certificed 3-seater ski. Stability would be about average for its class. But it's like a riding a bicycle. You need to counterbalance espeically in low speed manuvering. And again just like bicycle, faster you go, more stable it is.[/QUOTE]

  5. #5
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Its not difficult but you need the impeller wrench tool to do so properly

    http://www.4-tecperformance.com/inde...oducts_id=1081

    Sean

  6. #6
    03stx12f's Avatar
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    I had a 03, the first year and it was a very reliable ski. I later bought a 08 15f and it had a noticeable more bottom end but was only about 5 mph faster on top end.

  7. #7
    Quote Originally Posted by driveumhard View Post
    Is the jetpump bearing a pain to check? I'm guessing you need to pull the pump??
    Yes on 2005 and later models. On 2003-4, you just simply remove the end cap cone with the pump still on the ski and you can access the front bearing if you just want to check only (& not replace).

    Since you are looking at a 2007, the pump needs to be pulled. If I were you, I will just replace the bearings (relatevely cheap) anyway if they are the original from the factory. Why waste all the labor time you spent just to get there? Then you are good for next 100+ hours on 12F.

    Here is the impeller tool that you would need to remove the impeller to get to the bearings.



    Here is a general layout of parts associated with the jet pump for 2012+ 15F. The 2007 12 has only one front bearing whereas shown below has 2 front bearings indicated by the red arrows.

    Last edited by meangreenman; 01-18-2014 at 11:27 PM.

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  9. #8
    driveumhard's Avatar
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    Quote Originally Posted by meangreenman View Post
    Quote Originally Posted by driveumhard View Post
    Is the jetpump bearing a pain to check? I'm guessing you need to pull the pump??
    Yes on 2005 and later models. On 2003-4, you just simply remove the end cap cone with the pump still on the ski and you can access the front bearing if you just want to check only (& not replace).

    Since you are looking at a 2007, the pump needs to be pulled. If I were you, I will just replace the bearings (relatevely cheap) anyway if they are the original from the factory. Why waste all the labor time you spent just to get there? Then you are good for 100+ hours on 12F.

    Here is the impeller tool that you would need to remove the impeller to get to the bearings.



    Here is a general layout of parts associated with the jet pump for 2012+ 15F. The 2007 12 has only one front bearing whereas shown below has 2 front bearings indicated by the red arrows.

    This is very helpful. Thank you!!

  10. +1 by:


  11. #9
    driveumhard's Avatar
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    I've been reading about some guys changing these pump bearings every two years!! Is that really necessary? What is the main factor that makes these bearings fail???
    Thank you!

  12. #10
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    I have not had to change the bearings in my 12f ever and its an 04 with 250hrs, do I recommend waiting that long? No but I keep an eye on my stuff

    Sean

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