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Husqvarna 2100 scored piston.

Discussion in 'The Repair Shop' started by Newman, Nov 8, 2019.

  1. Al Smith

    Al Smith Pinnacle OPE Member

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    You could probably have Wiseco make duplicates but my word the price would be like the national debt .
     
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  2. Marshy

    Marshy WFO Cutting

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    CCC has one in the works. It does not sound like a drop in "plug-and-play" piston though.
     
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  3. Stump Shot

    Stump Shot Old *pretty boy dipstick of Quality

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    Ed Zachary, it's for building up a hot rod, requiring machining and such. Which is cool, but not the same thing as a good quality replacement piston.
     
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  4. Newman

    Newman Well-Known OPE Member

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    WOW, Thank you all so much for your imputes.. I have pulled the jug off, and here is the sad story. As you can see I did a very POOR job cleaning up the inside of the cylinder.. I used Hydrochloric Acid thinking it would react with the Aluminum and turn white in color, and when there was no more white it would indicate, my cleaning process was complete. I then used some 500 grit emery paper very lightly, not wanting to damage the nikasil coating. My theory is; that in this Aluminum transfer process, some of the deposits are in the form of Aluminum Oxide which is a product of the high temperatures created by the lean fuel mixture. The Aluminum Oxide is very hard and abrasive, and was not entirely removed by the acid cleaning. Anyway, I'm going to start over and do the proper buffing procedure as instructed by Mastermind.
    I'm thinking I will just replace the rings, since the piston is not that bad. Any concerns about that? Also, as you can see this Greek piston has the ring alignment pins over on the exhaust side ( as indicated by the top arrow). I was thinking I should turn the piston around. Is there any reason they marked the piston in this direction? There are no manufacturing marks from any casting company on the piston, and I had to grind the inside in order to get the connecting rod to even fit in between the wrist pin journals. Definitely not the quality that DLA brags about..
    I'll save the Johnnie Walker Blue for when I finally get this thing running right. Thanks again for all your help.. Regards, Martin


    IMG_1893.JPG IMG_1894.JPG IMG_1895.JPG IMG_1897.JPG
     
  5. Dolkitafreak

    Dolkitafreak Dolkita686

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    Looks like the manufacturer made a mistake, the ring ends should be turned towards the intake side. The piston does still look usable however. As for the cylinder, it needs more cleaning, often when you're done, you can't tell there was ever any transfer.
     
  6. Al Smith

    Al Smith Pinnacle OPE Member

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    Good catch--Dummies put the arrow on the wrong side .
     
  7. wcorey

    wcorey Pinnacle OPE Member

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    IIRC the 2100 came with a number of different pistons and at least one version had exhaust facing ring pins.
    As long as the ring ends clear the ports sufficiently there shouldn't be an issue either way.
     
  8. Junk Meister

    Junk Meister Super OPE Member

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    One thing that stands out in a thread like this ;
    Every one has an opinion,, most of them good .. but no better way to learn than to ask for advice and then to learn from everyone. Remember to keep us snoopy readers updated
     
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  9. Junk Meister

    Junk Meister Super OPE Member

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    That is unusual are there many piston/saws this way?
     
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  10. mdavlee

    mdavlee Hillbilly grinder

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    More than you’d think. Some newer Stihl’s have one on the exhaust side and one on the Intake side.
     
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  11. Whitty21

    Whitty21 Pinnacle OPE Member

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    If you are interested I have both a new in box golf piston. As well as a used jug and slug in decent shape that I may be willing to let go
     
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  12. Mastermind

    Mastermind Leader Of The Clique Staff Member

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    You're a good man. I'd rather see him learn to clean up what he has, and properly vacuum test it before throwing more good parts at it.
     
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  13. Al Smith

    Al Smith Pinnacle OPE Member

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    Pictures can be deceiving but from what I see it looks like the old Scotch -Bright and kerosene treatment would cure what ails it .
     
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  14. Whitty21

    Whitty21 Pinnacle OPE Member

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    Fair point. Cylinders are starting to become unobtainium.

    I have had quite a bit of luck saving cylinders with q-tips of muriatic and hand sanding from 150 up to 400grit emory.

    One tip I have is to feel for ridges with your nail, not finger tip, as most of us probably have pretty banged up senseless finger tips
     
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  15. Mastermind

    Mastermind Leader Of The Clique Staff Member

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    Maybe. I would go over it with 320 grit, then red scotchbrite to be sure though.
     
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  16. Definitive Dave

    Definitive Dave Race Obsessed Staff Member

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    direct drop in replacement also in the works :)
     
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  17. Al Smith

    Al Smith Pinnacle OPE Member

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    Just a comment .The example in question is a CD model,same as mine .From what I gather the XP used a thin ring piston as opposed to the thick ring .Again I'm no expert on Husqvarnas but Copsey had a XP he brought to a GTG that belonged to someone else .It had been tweeked .I think mine has been also .He out ran me over the blocks by a little bit .What surprised me was that thin ring was a breeze to pull over .Mine is like rope starting a Harley .Copsey said that was typical of those models ,
     
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  18. Al Smith

    Al Smith Pinnacle OPE Member

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    This talk of repairing cylinders has many options,many would work .This is another option Lisle precision cylinder hone .something you just don't see every day .Unlike a brake hone or standard cylinder hone this can be used to finish hone to almost perfection with regards to taper and ovality .I've only used it on iron cylinders but it has the special shoes and wipers for hard chrome/hard nickle .I'm reluctant to use it on plated cylinders myself preferring to the age old arm strong /elbow grease method .
     

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  19. Mastermind

    Mastermind Leader Of The Clique Staff Member

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    I have one of those.....great tools for final finish on iron bores. Like you, I've never tried it on plated bores though.
     
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  20. Al Smith

    Al Smith Pinnacle OPE Member

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    Then comes the problem of getting the residue out of the cylinder after it's been worked over . Compressed air isn't going to cut it . A bucket of kerosene with an old paint brush might . Adam Clarke stuck it in the kitchen sink in hot water with dish soap like Dawn and a sponge .Snelling ,a braver man than I stuck them in the dishwasher .If I did that it would be about as popular as a turd in a punch bowl .I just use hot water in a bucket and Dawn ---outside not in the kitchen. Heaven forbid !
     
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