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why me? 372 blown...again

Discussion in 'Chainsaws' started by Mattyo, Jan 13, 2018.

  1. Mattyo

    Mattyo Youtube speciawist

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    Ok, who's made this mistake?

    So, ran a freshly rebuilt 372 at Dan's this last weekend. Power was...eh....ok. Not great. gave out in the cut, wouldn't idle quite right. maybe airleak, who knows. carb is kitted, coil is oem, but used.

    was having issues oiling too... so I may need to take it apart and investigate that.

    did a comp reading.... 185. which is about where it started anyway. pulled the muff. starting to bugger the piston . :(

    pressure test. holds pressure fine, but fails on vac. asdfjkl;asefo;ijaweo;fijawo;efijao;weifj












    WRONG EFFING CLUTCH. the clutch goes on sloppy and tightens up, but is obviously not the right thread. wtf??? I don't know how did I didn't notice that when I was initially putting it together, but it didn't even occur to me that husky made an identical clutch with different thread.... WTF would they do that???? m15x1.25 vs m14x1.25 372? I spun another clutch on and the leak dissappeared.

    I must have gotten a 576 clutch in a pile of parts and not noticed.

    now I gotta get ANOTHER new piston and cut another popup. UGH.



    KUDOs to CRAIG TIMMONS from my youtube channel for the idea that this is a 576 clutch!
     
    Last edited: Jan 13, 2018
    MustangMike, danimal, smokey7 and 3 others like this.
  2. huskihl

    huskihl Just an ordinary member

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    If it was tuned correctly, it still wouldn't score though. Unless it was intermittent. I'd still be looking for something around the exhaust port that caused the scoring
     
  3. Chainsaw Jim

    Chainsaw Jim #fartedinthebandwagon

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    Why not change the seals?
     
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  4. Mattyo

    Mattyo Youtube speciawist

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    new seals
     
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  5. Mattyo

    Mattyo Youtube speciawist

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    the vac leak was considerable ....

    and is either that, or the fuel line was nearly kinked in the airbox... that might not have helped
     
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  6. RI Chevy

    RI Chevy Stihl Runner

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    Those damn Hooskies. Sorry Matt.
     
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  7. paragonbuilder

    paragonbuilder Jon1212 Approved!

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    All I can add is when I tried to tune it, I couldn’t get it to hold tune. I wasn’t paying enough attention to know after you started messing with it. I know at one point you thought you had it then it just plain stopped dead in the cut on you.
     
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  8. RI Chevy

    RI Chevy Stihl Runner

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  9. Mattyo

    Mattyo Youtube speciawist

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    hey, stihl did this with the 661 also... the clutch thread is m13x1.0 ... instead of m12x1.0 like the 660.
     
  10. RI Chevy

    RI Chevy Stihl Runner

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    Just trying to crack a smile in an otherwise sad situation. Lol
     
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  11. Mattyo

    Mattyo Youtube speciawist

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    as luck would have it, I have another piston supposed to arrive... yesterday.... guess what.... package in limbo... AGAIN
     
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  12. RI Chevy

    RI Chevy Stihl Runner

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    Damn USPS. LOL
     
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  13. Derf

    Derf Pinnacle OPE Member

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    I mailed a package last week here in Long Island to Queens (just 20 miles away). A week later and it still isn’t there. What’s up USPS???

    Also, I recall the failed spring on my 372xp clutch looked nearly identical to the 576xp clutch spring, but was missing the little notches in the corner, causing it to sit cockeyed. The devil is in the details.
     
  14. Tor R

    Tor R Regular member

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    What part number has the M15×1.25 576 clutch?
     
  15. Mattyo

    Mattyo Youtube speciawist

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    1515886159541-574035496.jpg



    No part number....
     
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  16. Mattyo

    Mattyo Youtube speciawist

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    20180113_183051.jpg
     
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  17. Mattyo

    Mattyo Youtube speciawist

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    The dirty one is 372....and has smaller threads than the other.
     
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  18. Stump Shot

    Stump Shot Old *pretty boy dipstick of Quality

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    Clutch abuse! Poor little feller in the trash like that all sad and lonely. Lol

    I have a 570 here if you need any measurements Matt.
     
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  19. Mattyo

    Mattyo Youtube speciawist

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    i recovered the clutch....but i'm pretty pissed at it

    if you can measure the ID of the clutch threads on your 570 that'd be great
     
  20. Stump Shot

    Stump Shot Old *pretty boy dipstick of Quality

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    OK, back in a bit...
     
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