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Dolmar PS-401 Mods?

Discussion in 'Chainsaw' started by foche911, Nov 18, 2010.

  1. foche911

    foche911 ArboristSite Operative

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    Are there Threads for Dolmar PS-401 Modifications? Any detailed Pictures or Tutorials here on ArboristSite or other sites?
     
  2. blsnelling

    blsnelling Site Sponsor

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    A simple muffler mod will go a long ways to making it a good runner. The one I had was tuned so poorly from the factory that it was virtually unusable. The L was so lean, even against the stop, that it wouldn't rev up.
     
  3. CGC4200

    CGC4200 Addicted to ArboristSite

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    get a better chain, keep it sharp & do maintenance

    Use it for a limbing saw and get a larger one if you need to modify &
    cut bigger wood.
     
  4. blsnelling

    blsnelling Site Sponsor

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    A muffler mod is free HP, simply regaining what the EPA and/or OSHA took away. It makes a big difference on a lot of saws.
     
  5. foche911

    foche911 ArboristSite Operative

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    I don't have your experience, but this one seems similar. I bought it slightly used, it surged at top, if that is right term. H limiter cap was gone. I carefully opened it up, ran better. Then more, but I don't have a tach, though I think it is still running slow. I compared it to my J 2149...for seat of pants perspective....Yes I know is rated 12,000 rpm. Also, it stalls in cut sometimes. I wonder if 411 clutch is needed. I think it is not broken in, it seems to run better with more time. One more thing, it seems to be using a lot of fuel. I will have to check actual capacity.
     
  6. blsnelling

    blsnelling Site Sponsor

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    If you don't have experience tuning by ear, you really need to get it tuned with a tach. Too lean, and you burn it up. Too rich, and it doesn't make the power it should.
     
  7. foche911

    foche911 ArboristSite Operative

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    Yes, I understand that from studying posts here. Where can I purchase a good tach? I am a distance from dealer, so I best invest in one rather than spend the money on gasoline. I am a farmer, so will learn it well enough.
     
  8. foche911

    foche911 ArboristSite Operative

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    Yes, I have a Jonsereds 2149, so far stock. Not big trees here.
     
  9. foche911

    foche911 ArboristSite Operative

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    Thanks for advice/cautions . . . .but what about my original Q? Is there knowledge about muffler mod on any threads here on ArboristSite?
     
  10. blsnelling

    blsnelling Site Sponsor

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    I have and really like this Fast-Tach, LINK. I believe you can get them from one of our sponsors, not sure though. Once you start tuning with the tach, you'll develope an ear for how it should sound.
     
  11. blsnelling

    blsnelling Site Sponsor

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    Now that right there is funny;) You can't hardly read a thread here without talk about a muffler mod. I may have posted what I did to the one I had. I'll have to look.
     
  12. blsnelling

    blsnelling Site Sponsor

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    Here are a couple threads I did about the 401. Unfortunately, I don't see any pics of the muffler mod. Thread 1, Thread 2.
     
  13. foche911

    foche911 ArboristSite Operative

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    Da, I thought I had seen PS401 threads involving you, which provoked me towards needing this little saw . . .but I haven't been able to find it again cos I am lazy :)
     
  14. blsnelling

    blsnelling Site Sponsor

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    With the search function now broken, you can't even search for these thread with my name as the creator. I had to just start looking through all my old threads.
     
  15. foche911

    foche911 ArboristSite Operative

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    Thanks. Is muffler if opened wrong (too much?) bad for saw? Is there any general threads on muffler work?
    I am aware muffler is not cheap, but I have common sense most of time. Or should I learn on a lesser saw?
     
  16. CGC4200

    CGC4200 Addicted to ArboristSite

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    Fast tach

    One of AS sponsors, Edge & Engine sells them or something better;
    they are Dolmar dealers & could help with parts & maybe help.
     
  17. foche911

    foche911 ArboristSite Operative

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    Was there a thread that compared RedMax 3800 and PS401 and mods? I have note here about something like that...??
     
  18. foche911

    foche911 ArboristSite Operative

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    Thanks . .good, cos I don't have great dealer near here, as far as I know. Only sellers that are mower shops and coming and going. I just talked to one (70 miles distant) that says he is quitting soon.
     
  19. tdi-rick

    tdi-rick Addicted to ArboristSite

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    The PS33-PS411 US/Aus/NZ muffler is pretty restricted and can easily be opened up inside as the muffler comes apart to get to the screen.

    Just don't go over about 85% of the exhaust port opening at the cylinder face when you open the muffler outlets and you'll be right, although up to 100% is fine.
     
  20. foche911

    foche911 ArboristSite Operative

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    What about the other muffler shown on DOLMAR Spare Parts List ? (non US, CA. AUS, NZ) I see P\N 021 174 301 . . . .
     

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