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Got a mates MS231 to mend

Discussion in 'Chainsaws' started by MattG, Jan 11, 2018 at 1:30 PM.

  1. Adamski

    Adamski Plebus Splederns

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    Literally read this. Haha my thoughts too
     
  2. angelo c

    angelo c Larger Member

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    Matt, I would swap out the bar/chain/sprocket in that order and see which one isolates that whirring. its in the driveline somewhere. seems to me ( from my armchair a few thousand kilometers away) that its binding somewhere as the chain seems to stop abruptly somewhat as well. Make sure the bar tip is free and not sliding in its bearing.

    Cheers....as we say here in the lovely "New" Jersey.
     
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  3. nohoff

    nohoff professional flusher

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    If you need the 41.5 mm piston just write me.
    Stihl has 7 pistons on stock.

    They build the saw nearly 3 years with that 41.5 mm piston.
     
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  4. MattG

    MattG Chainosaurus Rex

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    Thanks for all your ideas and help people,

    What @angelo c said about something nipping up around the PTO side is quite astute. Yeah I did notice that although the chain doesn't creep along with the clutch, it (the chain) did stop very quickly after a cut.

    But what @Adamski and @huskyboy said about the f/w side is worth a check.

    I'll take a good look today and see what else I find.

    Still wish these tree guys would be more descriptive about what they actually want checking on their saws!!!
     
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  5. huskyboy

    huskyboy ONE OF THE GREATEST!

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    Flywheel whine is pretty normal on a lot of saws.
     
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  6. MattG

    MattG Chainosaurus Rex

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    So I spent a bit of the morning re-looking at it. Basically the noise was Bar and chain related. I think since I'm used to MMd and ported out saws of late, and this saw is newish (well 2011 ;) and EPAd, I just heard the noise more...

    This is it with no B/C



    this is with my 14" setup, chain tensioned how I usually do



    and back to the customers 16" setup tensioned as loose as I dare:



    I did later set Darren's saw up in the vice and I reckon the chain has a lot of tight spots, various points where it'd snag by several mill (5-6 I think) and others where it jumps back into the bar.

    Also found some slight burrs on inside of the outer edge of the cl. drum, but I just dressed these before greasing the bearing and reassembling.
     
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  7. angelo c

    angelo c Larger Member

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  8. MattG

    MattG Chainosaurus Rex

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    @angelo c
    I sending you, your prize, right now. It's a 036 oil line kit!!!
    :risas3:
     
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  9. angelo c

    angelo c Larger Member

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    I got the derned kits....its the skills to use them I'm lacking!!! :)
     
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  10. MattG

    MattG Chainosaurus Rex

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    Anyway the saw seems like it has recently been serviced. (So being a suspicious guy I still suspect that I was being given an "honesty test" ?? Opinions please !).

    The plug looks clean and a couple months old, gap is spot on. The A/filter was very clean. It oils and revs so well that I'll didn't bother with the gas and oil filters - I'm sure they will be fine, but if he wants to pay for more work from me, then I'll certainly change out.

    I can still faintly see machining (from the factory) marks on the piston so it's ran well, and has been maintained properly.

    2018-01-13 11.13.20.jpg
    there is slight coloration below the ring land, but I imagine this to be normal as the exhaust side of a 2 stroke will probably char left over skirt oil over time.

    2018-01-13 11.14.21.jpg
    man but aren't these stratos weird??? This is the first one I've looked at through the muffler, and you can see weird coloration again on the cylinder wall:

    2018-01-13 11.15.34.jpg
    however I know that things are ok ish with it, due to the visibility of the factory's circumferential lines on the piston body, and when I was (just about) able to squint through the tiny plug hole:

    2018-01-13 11.27.47.jpg
    I see a very clean piston crown.
     
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  11. angelo c

    angelo c Larger Member

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    Matt. Can you check the compression on that saw. Trying to think through the build-up below the bottom ring. Looks like some combustion is getting past the rings
     
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  12. MattG

    MattG Chainosaurus Rex

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    I wish I could Ange , thing is, it's got one of those tiny NGK CMR6H plugs. Too small for my tester, I guess I need an adapter :(

    The comp feels ok on a pull, but it's only ~41cc saw, so who knows? Certainly looks ok and piston wear (i.e. lack of) dept.
     
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