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Thread: Winterizing a sport jet

  1. #1
    Member AlaskaRanger's Avatar
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    Default Winterizing a sport jet

    What all should be done to a sport jet motor for the cold winters here in Alaska?

  2. #2
    Member fishnhuntr's Avatar
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    Fog it, treat the fuel, pull the batteries, cover it, about all I ever did, pretty simple. I guess you could change out the fuel filters if it's time, and possibly drain the oil out, I never did the oil though. Sucks putting her up though huh lol.

  3. #3
    Member AK Troutbum's Avatar
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    Don't forget to drain the heater and sand trap if you got 'em.

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    Member Crumm's Avatar
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    Quote Originally Posted by fishnhuntr View Post
    Fog it.
    Mercury strongly recommends that the Optimax should NOT BE fogged. Something about the fuel injectors if I recall. If you have a carburated sport jet then fog away.


    1. Change the gear oil and stator oil so you can see if the seal are bad. If there is a bad seal then there will be water in the oil which will freeze and break the case.
    2. Drain the heater, heater hoses and sand trap.
    3. Some guys treat the fuel, others say fuel in Alaska is already treated and will last for years. I have never treated mine and it always seemed fine
    4. Make sure the thermostat housing is vertical so all water will drain out of it.
    5. Make sure battery is fully charged and disconnect it. No need to pull it as charged battery's last years longer in the cold than they do in the warm.

  5. #5
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    The only thing that I would do to the battery is check the water levels in it and disconnect em. For the really cold weather the water is what keeps them from freezing due to the chemical reaction.. If they are low, use distilled water to fill the cells... Yeah, carburated - fog, at the marina that I worked at, we had a special mixture of fuel to run the fuel injected motors on to keep gunk from forming in the fuel injector assembly.. It consisted of 2stroke oil, fuel stabilizer, fuel conditioner, and somethin else that I can't remember... I think it is a mercury designed mix. Besides that make sure all the water is out of the motor and accessories so that nothing cracks/explodes! Good luck

  6. #6
    Member skybust's Avatar
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    Default drain the heater

    stupid question how do you drain the heater. I have drained the two hose that run to the heater and still need to do the sand trap and that was all I was told by craig at compueas when i got the boat.

  7. #7
    Member AlaskaRanger's Avatar
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    Thumbs up Thanks.....

    For all the info..... By the way, I have a sportjet 210. (Carburator)

  8. #8
    Member Crumm's Avatar
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    Quote Originally Posted by skybust View Post
    stupid question how do you drain the heater.
    Just disconnect the hoses from it.

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    Heater has a threaded drain cap mounted in one of the hoses.

  10. #10
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    Quote Originally Posted by AkRascal View Post
    Heater has a threaded drain cap mounted in one of the hoses.
    OOPS, meant to say that my heater has a threaded drain cap, don't know if they all do.

  11. #11
    Member AK Troutbum's Avatar
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    I also went ahead and pulled the thermostat and put it away in the garage to make sure that wouldn't freeze up. Probably overkill but it was easy enough to do.

  12. #12
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    Default my merc winter prep

    For my 200 merc. sportjet, all I do is"
    1. make sure the jet is clean.
    2. put Sta-Bill in the fuel tank and store with a full tank of gas.
    3. run the boat for 5 minutes to pull the winterized fuel through the carb.
    4. pull the batteries and store in the garage on a block of wood and hook to a maintanence charger to keep them topped off.
    5. cover with the tarp and put it away.

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