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

Muffler Modification?

Discussion in 'Chainsaws and Power Equipment' started by Chvymn99, Nov 10, 2013.

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  1. clemsonfor

    clemsonfor

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    U still have the limiters in there but I guess with that piece removed there is nothing to hit against? U will notice a good bit of power increase. Don't forget the outer cover to open it up some
     
    clemsonfor, Dec 24, 2013
    #61 Top
  2. Chvymn99

    Chvymn99 Moderator

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    The red caps came right off after that cover came off.
     
    Chvymn99, Dec 24, 2013
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  3. Chvymn99

    Chvymn99 Moderator

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    Here is the before:

    [​IMG]
     
    Chvymn99, Dec 24, 2013
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  4. Chvymn99

    Chvymn99 Moderator

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    Here is in the garage, after the MM.... does it sounds OK?

    [​IMG]
     
    Chvymn99, Dec 24, 2013
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  5. Chvymn99

    Chvymn99 Moderator

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    Here is back at the wood pile for a comparision...

    [​IMG]
     
    Chvymn99, Dec 24, 2013
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  6. clemsonfor

    clemsonfor

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    I know they would come off but with the plate out there is nothing to "limit" against to it do sent matter? U gonna put the plate back in and cut the tabs off the caps or leave it be?
     
    clemsonfor, Dec 24, 2013
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  7. Chvymn99

    Chvymn99 Moderator

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    I put the plate back on, and left the caps off. I destroyed the one cap, originally.
    When the cover popped it off it made
    all so much easier to take off. So for now, I'm going to leave it as is.
     
    Chvymn99, Dec 24, 2013
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  8. clemsonfor

    clemsonfor

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    Sorry u guys have so much trouble with them, I'm sure my next one will be that way now!! I am not trying to say how good I am or anything I just had no trouble with them.

    Another of our field foresters told me I can have his old 250 when I see him next so I bet I will pay on that one!
     
    clemsonfor, Dec 24, 2013
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  9. Chvymn99

    Chvymn99 Moderator

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    Just like something's in life. If you hold your tongue just right, things work out....
     
    Chvymn99, Dec 24, 2013
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  10. MasterMech

    MasterMech The Mechanical Moderator

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    So have you made any adjustments to the carb? Sounds like it idles good, pretty lean on the high side but hard to tell since you are real short with the trigger. Give us one with the throttle pinned for 2-3 seconds and I can tell you more.
     
    MasterMech, Dec 24, 2013
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  11. fox9988

    fox9988

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    +1 sounds good. Just need to stay in the throttle a little longer to see if it starts 4 stroking as MM mentioned. It should 4 stroke at Wide Open Throttle with no load on it, and smooth out (2 stroke) at WOT with the bar in the wood.
     
    fox9988, Dec 24, 2013
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  12. fox9988

    fox9988

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    fox9988, Dec 24, 2013
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  13. Chvymn99

    Chvymn99 Moderator

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    Yes, watched your youtube movie and tried to mimic it. I'll do that tomorrow at some point.

    Yea, at one time, I must have tweaked too much on the low side. Killed it and and couldn't get it started again. Had to go back to original settings off bottom. Thanks.
     
    Chvymn99, Dec 24, 2013
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  14. fox9988

    fox9988

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    For the record, not my video. But it's one of my favorite "how to" tune video.
    You'll get it lined out and be able to do a carb adjustment no problem in the future.
     
    fox9988, Dec 24, 2013
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  15. MasterMech

    MasterMech The Mechanical Moderator

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    That's Brad Snelling, I'm pretty sure he knows how to tune a carb.... ;)

    I like that video too, that's a big-azz saw and it makes it easy to hear what's going on.
     
    MasterMech, Dec 24, 2013
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  16. clemsonfor

    clemsonfor

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    Yea even with the way you modded the muffler its tough to hear the 4 stroke if your not use to it. My 390 is better like that bit still tough compared to the husky 372 or stihl 650!
     
    clemsonfor, Dec 24, 2013
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  17. Pyroholic

    Pyroholic

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    I had one of the eight I've done that had that plate come out. No big deal, I just put it back in without the limits. Prob would have just left it out, but it was one of my few paid mm jobs. Wanted it to look pro. Was a non running 290 with just 6 tanks ran thru it. Carb clean and mm for $100. Not bad for a garage hack like myself.
     
    Pyroholic, Dec 24, 2013
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  18. Chvymn99

    Chvymn99 Moderator

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    I took this video this morning. Was I long enough on the trigger?

    [​IMG]
     
    Chvymn99, Dec 29, 2013
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  19. clemsonfor

    clemsonfor

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    Sounds OK but maybe lean but I have trouble on vids hearing the 4 stroke ESP with that mods its harder to hear to me.
     
    Last edited: Dec 29, 2013
    clemsonfor, Dec 29, 2013
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  20. fox9988

    fox9988

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    Too lean. Hear how it screams and sounds nice and smooth? Richen it up until it starts to miss, that miss is 4 stroking. Once it is tuned right, it will 4 stroke at WOT with no load but will smooth out and 2 stroke when the chain is in wood.

    Also, make sure you warm up the saw before tuning/videoing.
     
    fox9988, Dec 29, 2013
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