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Got a mates MS231 to mend

Discussion in 'Chainsaws' started by MattG, Jan 11, 2018.

  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 Sorta a Husqvarna guy.

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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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  13. MattG

    MattG Chainosaurus Rex

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    Update on this saw. The owner ended up asking me to muffler mod the saw. I opened the outlet, hacked at the inner baffle as much as I could reach to do so, and as there seemed to be a lot of metal overlapping the gasket at the flange + the muffler inlet, I carefully dremeled this away. Then I removed the stupid limiter cap on the H screw and (eventually!) watched Brad's tuning a rev-limited saw for clues on what to do.

    Here's what it's currently like:



    Insults and comments welcome. :)
     
  14. MattG

    MattG Chainosaurus Rex

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    Ok, this is where I'm asking for advice and opinions. So I took off the limiter cap that was one the H screw. Yes only one fitted to this model just for the H side.

    upload_2018-1-20_16-43-1.png

    So I'm wondering whether I should reinstall another cap, but with the locking lug removed, in order to help hold the screw in position? However I think that as the L screw which of almost identical design has no such cap fitted, then the H screw will be ok just leaving as it is. I hope so, since I'm kinda starting to get bored with working on this particular saw... ;)
     
  15. angelo c

    angelo c Larger Member

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    its easier to find the hole( fat chick rolling in flour ect) when you leave the cap fitted but trimmed off to allow full range of motion.
    the screw driver tends to wonder about less with the cap...
     
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  16. MattG

    MattG Chainosaurus Rex

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    I know what you are saying Ange, it was a right PITA, until I managed to find the *exact* screwdriver, and marked on it's shank where this slipped down to against the cover, such that the flat of the driver was in the chick's slot (continuing your analogy I believe).

    But do you reckon I'm good leaving the cap off seeing as the L doesn't even come with one? Just getting kind of sick of working on that saw......thought I do think she sounds and runs a lot better after my MM :)
     
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  17. angelo c

    angelo c Larger Member

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    Pure preference...but when the saw is bouncing around on a stump and I'm trying to tune it with one hand and hold it with the other...
    The less I fiddle with ....and the more I screw....the better... :)
    I've done both ways and settled with cutting tabs and returning. These new style limited tend to suck though.
     
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