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  1. #1
    Carson's Avatar
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    I am a bit confused.

    I just read a post and of course this is a stupid, stupid question. My MAG piston is solid black, the CEN is a little black but it is not covered. The PTO - being replaced - has a hole in it and it is Completely aluminiom and has NO black on it at all.

    Little confused here, but I am almost positive that I am running lean. I thought that if you were all black on the piston head you were running rich.

    The post I read said I was running rich. Therefor it lead me to this post.

    Thanks to all help, Carson.


  2. #2
    seaobin's Avatar
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    Do a search for "Piston wash" It has been covered extensively

  3. #3
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    Generally the more black a piston top is, the leaner you are running. You are looking for clean spots on the top of the piston. The larger the clean spot, the richer you are running.

  4. #4
    LaveyT's Avatar
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    Quote Originally Posted by Carson View Post
    I just read a post and of course this is a stupid, stupid question. My MAG piston is solid black, the CEN is a little black but it is not covered. The PTO - being replaced - has a hole in it and it is Completely aluminiom and has NO black on it at all.

    Little confused here, but I am almost positive that I am running lean. I thought that if you were all black on the piston head you were running rich.

    The post I read said I was running rich. Therefor it lead me to this post.

    Thanks to all help, Carson.
    After the hole is burned in the piston the fuel being delivered does not burn and washes the "Holey" piston clean.

  5. #5
    Carson's Avatar
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    Ok and tuning the carburetors will help this, correct? I have the 3-outlet fuel pump.

  6. #6
    LaveyT's Avatar
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    Quote Originally Posted by Carson View Post
    Ok and tuning the carburetors will help this, correct? I have the 3-outlet fuel pump.
    If the burn down happened with the triple outlet pump already in the ski there is another problem. You could have an air leak from any number of places.(a leak down test will show alot). Any place in the fuel system that lets air into the fuel line like the fuel on/of switch can cause it as well.
    If it burned down with the old fuel pump you are probably in the clear.

    This link explains alot,
    http://www.greenhulk.net/forums/show...-750-780-785-s

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