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  1. #1

    Pre-mix in 4-stroke

    Is there any harm in having a little amount of pre-mix in the fuel tank? I'm talking less than an ounce. I have fuel jugs that I use to mix for my superjet. When It is empty there is always a small amount left, I then get more fuel and it goes in my RXP. 3 Jugs= maybe an ounce or more of pre-mix. Would this in any way hinder performance?


  2. #2
    R.I.P. 11's Avatar
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    Would you do it in your truck/car?

    Hope not, sometimes you have weird ideas...

  3. #3
    It's not an idea, just something that I have been doing and wondered if it was bad.

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    Site Admin Green Hulk's Avatar
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    YES ITS BAD!!!

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    Amsoil makes a top end lubricant for auto's - just add to gas - since the 4-techs don't have any converters - a little oil ain't going to hurt. Your egt and breathers add oil thru the intake - at least in the gas it would avoid the intake track. Some even claim it does some good. I Have no personal knowledge - other than I sometimes add a little old gas to the truck instead of tossing it out.

    Tim

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    I know some racers who run 4-strokes that add 4 oz/tank to stop detination, but i think it's something that shouldn't be recommended.

  7. #7
    Moderator boataddict's Avatar
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    Be careful. Sometimes oil does not play well with injection systems.

  8. #8
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by BOATADDICT
    Be careful. Sometimes oil does not play well with injection systems.
    BINGO!!!!

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    Check Amsoil site - couldn't find the old 'top end lube' - maybe it was carbs only..... That's why I like this foum.

    Happy Ridin

    Tim

  10. #10
    way2fast's Avatar
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    Four stroke engines don't need the extra oil but having FI shouldn't affect anything if you did add it to the fuel. A lot of injected 2 strokes have been converted to pre mix and I never heard of any problems with the injectors. Race outboards run a really rich oil mix and have FI.


    Richard

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