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  1. #1
    XLTNoob
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    Piston I recieved in the mail (opinions)

    Just recieved the first of my XLT rebuild parts in the mail today..

    Not sure if this piston is worth putting in. What do you guys think?

    (To the seller: I'm not complaining, just looking for a second opinion)









    Seems pretty burnt to me.

    Also, How can I tell which type piston it was? ABCD (Orange, Green, Red, Purple) ?


  2. #2
    Happily Self-Employed WFO's Avatar
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    pics are way to small to see anything

  3. #3
    Happily Self-Employed WFO's Avatar
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    also do you know what the size difference is between an "A" and a "D"?

  4. #4
    Moderator Insanediego Joe's Avatar
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    Looks like there is some blow bye but I dont see any damage to the piston itself. Put some new rings on it and call it good. The dark area under the piston is normal as far as I can tell. You need to measure your bore and measure the piston at the lower end of the skirt and make sure you are within spec on clearance. Might also want to check your ring end gap and make sure the ring pin inside the ring landing hasnt pushed in that would allow the ring to spin and catch the exhaust port.

  5. #5
    XLTNoob
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    Click on the pics - They're actually quite huge.

    I'm just looking on the underside of the piston - when I posted pics of my similar-looking old piston, a few comments were made regarding running lean and heat "obviously showing on the piston"

    I know the difference between "A" and "D" pistons are in the thousandths = If it really doesnt matter than I'll be happy with any random piston. Just trying to make sure.

  6. #6
    Moderator Insanediego Joe's Avatar
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    Quote Originally Posted by Jolly Roger View Post
    Click on the pics - They're actually quite huge.

    I'm just looking on the underside of the piston - when I posted pics of my similar-looking old piston, a few comments were made regarding running lean and heat "obviously showing on the piston"

    I know the difference between "A" and "D" pistons are in the thousandths = If it really doesnt matter than I'll be happy with any random piston. Just trying to make sure.
    Based on the piston wash(your first picture) It wasnt that lean.

  7. #7
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by Jolly Roger View Post
    Click on the pics - They're actually quite huge.

    I'm just looking on the underside of the piston - when I posted pics of my similar-looking old piston, a few comments were made regarding running lean and heat "obviously showing on the piston"

    I know the difference between "A" and "D" pistons are in the thousandths = If it really doesnt matter than I'll be happy with any random piston. Just trying to make sure.
    That piston has good piston wash it is not lean, The oil on the underside of piston is normal all pistons do that with time.

  8. #8
    YudLuz2's Avatar
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    Looks like a normal used piston out of a stock boat.

  9. #9
    Moderator OsideBill's Avatar
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    I agree it looks fine for a used piston. A little solvent and elbow grease, that thing is shining. Add new rings and you are good to go.

  10. #10
    XLTNoob
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    So, compared to my old piston, which was confirmed as "ran lean" - What's the difference?

    Old Piston


    the best I can notice is that there is a edge of light brown around my black mark on the underside of the piston, where on the new piston there was no light brown discoloration, only black deposits.. Am I pretty much on track?

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