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  1. #1
    Libationist krokus's Avatar
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    Rough idle 07 250x with timing advance

    I installed the TBM timing cover and advanced it 6 degrees. The first day it ran great and I ran it really low on fuel (even though there is 5 gallons left it because of the pickup). Went out the next day and the idle was loping and it bogged off the start for a couple of seconds before taking off. Runs fine on the top end.

    Took it to the shop and they are scratching their heads. Checked the fuel and it is fine. Tech is supposed to check the fuel pressure. I tend to think it is electrical. I am searching but if anyone has any ideas I would appreciate a nudge in the correct direction.

    Checked the plugs -they look great and only have 30 hrs on them but I'll go ahead and replace them anyway. I'll have him check some things suggested in other threads - idle control motor, etc.


  2. #2
    Libationist krokus's Avatar
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    Oh, it's not throwing any fault codes.

  3. #3
    SAL08HO's Avatar
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    My 08 did the same when one of the plug fouled..Try the the basic stuff first especially if it sounds/moving good up top. How long was the fuel in tank for?

  4. #4
    Libationist krokus's Avatar
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    Quote Originally Posted by SAL08HO View Post
    My 08 did the same when one of the plug fouled..Try the the basic stuff first especially if it sounds/moving good up top. How long was the fuel in tank for?
    4 months but it was filled to the top with sta-bil'd ethanol free 93. I thought maybe the fact I ran it so low could have affected it but the tech tested the fuel and it was fine. Going to pick up the ski and change the plugs and go from there. Thanks.

  5. #5
    TEAM BRONX TECH FAT BOY's Avatar
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    Quote Originally Posted by krokus View Post
    I thought maybe the fact I ran it so low could have affected it but the tech tested the fuel and it was fine.
    that's not the problem.

  6. #6
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    Plugs.

  7. #7
    Libationist krokus's Avatar
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    Quote Originally Posted by FAT BOY View Post
    that's not the problem.
    Yep, it was the plugs. The tech couldn't figure it out...

  8. #8
    SAL08HO's Avatar
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    Quote Originally Posted by krokus View Post
    Yep, it was the plugs. The tech couldn't figure it out...
    Yep..good news !

  9. #9
    Libationist krokus's Avatar
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    The plugs looked good - not fouled, no water or rust and they had no more than 35 hours on them.

  10. #10
    ImpactSportsTV's Avatar
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    FWIW, 35 hours on the plugs is A LOT on that ski as they tend to foul from sitting after use - steam rising/back to the cylinders causing fouling, so the theory goes. Sometimes rust is visible, sometimes not. Several people, including myself have been changing plugs every 15 hours max, most have fouling between 15 - 20 hours. Use Anti-seize for sure and keep the torque on the very light side - broken plugs are a common problem in these skis. FYI - the latest Ultras (300X) come with an "exhaust filter" that is designed to combat the problem and it can be easily retrofitted to a 250X if you would like

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