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  1. #1

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    Sean I have a 12f question...

    I have exhausted every freaking option with my 12f from your troubleshooting posts. I have changed the fuel pump, regulator, my fuel pressure is at 43psi and my compression is good to go. Ive checked every electrical connection so on and so forth.. On the hose the ski runs great. when I have it on the water it gets up to 5000rpm and that is it. Feels like it running on three cylinders. I replaced all the plugs and i verified all 4 plugs have spark. I am stumped.....................Can you summon the jetski gods and have them bless me with good luck????? Thanks for all your help in advance.


  2. #2
    Wonder if SLO mode is activated and it's limitting the rpm...
    May want to ground the Yel/Blu wire (that goes to # 4 pin at ECU) to the engine block, and see if the rpm comes up any higher. It wouldn't hurt any, even if that's not the culprit.

  3. #3

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    I gave that a shot and no change. The display reads FPO also.

  4. #4
    Quote Originally Posted by Miceleb View Post
    compression is good to go.
    What's the psi on each cyl?
    Last edited by meangreenman; 07-03-2014 at 12:07 PM.

  5. #5

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    About 165 psi all cylinders....it only has about 90 hours on it.

  6. #6
    Quote Originally Posted by Miceleb View Post
    About 165 psi all cylinders....it only has about 90 hours on it.
    Quote Originally Posted by Miceleb View Post
    my compression is "good" to go.
    I don't understand how you came to your conclusion "good" with that low compression. ???
    Last time I checked, a good running 12F engine was pumping 235+ psi.
    Last edited by meangreenman; 07-03-2014 at 01:17 PM.

  7. #7

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    Quote Originally Posted by meangreenman View Post
    Quote Originally Posted by Miceleb View Post
    About 165 psi all cylinders....it only has about 90 hours on it.
    Quote Originally Posted by Miceleb View Post
    my compression is "good" to go.
    I don't understand how you came to your conclusion "good" with that low compression. ???
    Last time I checked, a good running 12F engine was pumping 235+ psi.
    Sorry cell phone typo....used a harbor freight compression gauge it was close to 265 in all cylinders.

  8. #8

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    The ski ran perfect around January then it sat until about june. I tried to fire it up a few weeks ago...no fuel. I replaced the fuel pump, filter, and regulator. It fired right up.....but now I am having trouble. I wonder if the pump sucked up some of the crap off of the bottom of the tank and clogged the fuel filter.....

  9. #9
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Entirely possible but not related, if you checked the pressure and it was good then its fine, filter is pre regulator.

    Sean

  10. #10

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    This weekend I am going to go back through everything and I will report back. If not, I am going to drop it off at the shop.

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