In loving memory of Kenis D. Keathley 6/4/81 - 3/27/22 Loving father, husband, brother, friend and firewood hoarder Rest in peace, Dexterday

How much compression does a MMWS have???

Discussion in 'Chainsaws and Power Equipment' started by Evanrude, Jan 11, 2015.

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  1. Evanrude

    Evanrude

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    Enough to do this when you don't use the decomp and it bites back...

    [​IMG]

    Didn't realize it when it happened. It took me a few minutes to figure it out. It just made it that much meaner when I dropped it in the log. They can't stay pretty forever, I suppose.
     
    Evanrude, Jan 11, 2015
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  2. Elderthewelder

    Elderthewelder

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    ouch!
     
    Elderthewelder, Jan 11, 2015
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  3. Guido Salvage

    Guido Salvage

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    Starting technique is everything. On high compression saws you need to roll it to TDC and then pull it like you mean it.
     
    Guido Salvage, Jan 11, 2015
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  4. Evanrude

    Evanrude

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    Oh trust me, I do. I have a habit of not using decomp on my saws and always tug the rope to the pulse before giving them a firm pull. This one just got the better of me today.
     
    Evanrude, Jan 11, 2015
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  5. NH_Wood

    NH_Wood

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    Dang! Now you have to start telling your buddies a better story - near miss widow-maker, angry beaver, encounter with crazy tree-hugger......Cheers!
     
    NH_Wood, Jan 11, 2015
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  6. Sunfish

    Sunfish

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    I thought Stihl plastic was tougher than that? ;)
     
    Sunfish, Jan 11, 2015
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  7. HoneyFuzz

    HoneyFuzz

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    Ouch indeed !!! That should give better airflow now ! Probably runs better now LOL :)
     
    HoneyFuzz, Jan 12, 2015
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  8. Chvymn99

    Chvymn99 Moderator

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    Whoops.... That'll buff right off..:emb:
     
    Chvymn99, Jan 12, 2015
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  9. Evanrude

    Evanrude

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    Me too. Apparently, they don't take well to being punched.

    I was able to pop the pieces back out without breaking any off. I'm going to put some screen on the backside with some epoxy. Hopefully they'll stay in place then.
     
    Evanrude, Jan 12, 2015
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  10. RJames

    RJames

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    Here you go chief!!
    Problem solved, if you can take the verbal abuse:D Sorry couldn't hep' it
    Screenshot_2015-01-12-09-24-43-1.png
     
    RJames, Jan 12, 2015
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  11. RJames

    RJames

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    Oh yeah, how's the hand??
    Hope no broken bones, that looked like you hit it HARD!
     
    RJames, Jan 12, 2015
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  12. Evanrude

    Evanrude

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    Hahah, no need for the massive handle. The saw caught and jumped into my hand - still holding the handle. Like I said, I didn't even know it happened right away. It took me a few minutes to figure out why my saw was like that! My hand is fine, I had good leather gloves on, can't even tell.
     
    Evanrude, Jan 12, 2015
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  13. RJames

    RJames

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    Glad you're ok. If that didn't hurt your hand, you are no sissy, sir.
    Then again, that ain't no sissy saw.

    I'd sure like to see how it turns out after you do the repair, if you don't mind.

    Thanks for sharing. I've been there myself, I
    only have 1 saw that has a decomp, and it's my smallest saw! My bigger ones are older, before the decomps were so common, so I've racked my knuckles more than once.

    Usually when I do it there's at least 2 people watching,:Dnever fails.
     
    RJames, Jan 12, 2015
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  14. GrJfer

    GrJfer

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    Chicks dig scars.
     
    GrJfer, Jan 12, 2015
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  15. clemsonfor

    clemsonfor

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    As pointed out on the chainsaw forum truths thread (CSFT) ...only sissies use the Docomp valve (not sure of the wording or number):)
     
    clemsonfor, Jan 12, 2015
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  16. Hedgerow

    Hedgerow

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    The extra comp makes em a little more sporty to pull over, but the timing advance is what "bites" ya..

    BAM!!
     
    Hedgerow, Jan 12, 2015
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  17. Chvymn99

    Chvymn99 Moderator

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    Call me any name you want too...:p.... But just don't call me late to dinner...:p......:rofl: :lol:
     
    Chvymn99, Jan 12, 2015
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  18. DexterDay

    DexterDay Administrator

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    My MM 460 is impossible to start without decomp.. At least by my little, short, fat self.... :) That is my only saw I MUST use it on. The Solo 681 has a plugged decomp. But it's not as bad.

    Glad your hand is o.k... Nice 440 :dex:
     
    DexterDay, Jan 12, 2015
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  19. cgraham1

    cgraham1

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    No problems here with my Mastermind 064 or 7900... but my 288 with the base gasket delete is a different story. Checked compression the other day and it's reading 183 psi. on my gauge. o_O
     
    cgraham1, Jan 13, 2015
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  20. Evanrude

    Evanrude

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    No complaining here, Clint. Just gotta learn to use decomp so it doesn't bite back. :saw:

    This saw just 1.5 tanks after port work. This has a used 046 D cylinder and new Meteor piston. I'm at 900' above sea level. My MMWS 260 pulls 205psi.

    [​IMG]
     
    Evanrude, Jan 13, 2015
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