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  1. #1
    Mr Waverunner's Avatar
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    Sea Foam for 2 cycle engines??? Be aware

    What'up guys is been a while.
    1998 XL 1200 with 303 hrs. 50:1 premix. Carbs rebuilded 3 years ago. Ran always fine and strong (58+mph)'til my son added 8 oz of this product to 10 galons of 93 octane Shell fuel. We always use Penzoil from Walmart. He said he did because he forgot to remove all the fuel from tank last year. Ski ran fine and strong for 2 hours all the sudden shutdown. #1 cylinder rod crank bearing failed. found all the pieces on top of #1 piston. Head ok, cylinder w/ minor score,piston damaged,reeds ok,crankshaft bad and crankcase cracked. The other 2 cylinders appears to been burning fine. Noticed that the damaged piston and oil passages looked dry compared to the other 2 that looks wet and well lubed.
    The only different thing he did was to add this product (Sea Foam). We own this ski for 9 years.
    Could this be the cause?
    Pic attached
    Thanks
    WTB 1998 XL or GP1200 crankcase and crankshaft
    The OEM part # for the case is 65U-15100-00-94, for the crank and rods is 65U-11400-00-00.
    Pay cash and pick up anywhere in Florida
    PM [email protected]
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  2. #2
    Stop staring at my tits NJJer's Avatar
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    Seafoam is so 1970's

    Anyone who uses it, should really learn just what it is and what it can and can not do.

    Sorry to hear about your engine. Seafoam can do many odd things, one of which is making the oil fall out of suspension. Also, the old gas has also lost lots of its octane points for being old. Lots of reasons why that engine could have gone, I don't like to comment on exact reasons unless I can see in person the exact damage. Pics and me don't get along, as they don't always tell the whole story.

    FYI, there is NOTHING you can add to old/er gasoline to "make it better".

  3. #3
    Mr Waverunner's Avatar
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    More pics
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  4. #4
    Moderator beerdart's Avatar
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    Quote Originally Posted by Mr Waverunner View Post
    'til my son added 8 oz of this product to 10 galons of 93 octane Shell fuel. We always use Penzoil from Walmart. He said he did because he forgot to remove all the fuel from tank last year.
    Did he substituted the seafoam for the penzoil 2-stroke oil?

  5. #5
    Mr Waverunner's Avatar
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    Quote Originally Posted by beerdart View Post
    Did he substituted the seafoam for the penzoil 2-stroke oil?
    No. He told me:
    1- he put 10 galons of 93 fuel to the tank,
    2- the amount of oil required at 50:1 ratio for 10 gal of fuel was mixed with 7-8oz of Sea Foam
    3- then added this mix to the fuel in the tank.

    Can the sea foam breakdown the 50:1 premix?? I don't think so.
    The damage, will show in all 3 cylinders
    Cylinders 2-3 show more lube than # 1
    I will post more pics as soon as I finish taking the engine appart

  6. #6
    agsbill's Avatar
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    I'm no expert butt....50-1 pre mix seems light on oil from all I've read here on GH.....Some are running 32-1...a majority are at 40-1.

    Bill

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Mr Waverunner View Post
    ...
    1- he put 10 galons of 93 fuel to the tank,
    2- the amount of oil required at 50:1 ratio for 10 gal of fuel was mixed with 7-8oz of Sea Foam
    3- then added this mix to the fuel in the tank...
    I don't know what the SeaFoam would do to the oil if the two are mixed together directly but even without the SeaFoam just dumping the oil into the fuel tank after putting the fuel in is not a good method. The 2-stroke oil can fail to mix well with the fuel, so the engine ends up running on straight gasoline.

    As others have said, any number of other factors could be involved. If the engine sat in storage, or has been used in salt water, rust may have gotten to the engine bearings. 300 running hours is within normal lifespan range for bearing failure.

  8. #8
    20 feet Boy's Avatar
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    air plane fuel will separate with 2 stoke oil so maybe sea foam will to. But it looks like something took out that cylinder. just by looking at the other cylinders.

  9. #9

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    I've winterized 100+ watercraft using Seafoam as a fuel stabilizer and never had any issues. I've never used Penzoil 2 stroke oil though.

  10. #10
    PolarisNut's Avatar
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    Personally, I don't like the idea of sea foam in the fuel tank, in a 2 stroke, but that's not what took the motor down...8oz in 16 gallons isn't going to do much of anything. You have other issues unrelated to Sea Foam. Look at the rust on the crank wheels...that's due to improper storage, and i'm sure is what caused your bearings to seize. Also, that piston wash is a little on the lean side IMO...I don't like running it that small.

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