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028 carb issues

Discussion in 'Chainsaw' started by motorhead99999, Feb 14, 2020.

  1. motorhead99999

    motorhead99999 Jeepin tree man

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    aquired a 028 eq wood boss that was straight gassed. I put a 028 super top on that I had. Not sure what brand it is. Anyways it passed vac and pressure test but I’ll set the carb so it 4 strokes out of the cut but after a couple minutes of cutting it acts like it’s running lean. I also changed fuel lines and filter when I rebuilt it. Is it possible that the adjustment screws are vibrating in? Seems like if they did anything they would go out. I also left out the base gasket because squish was a little thick.
    What’s your guys thoughts
     
  2. Stem450Husky

    Stem450Husky Wombat Rancher

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    did you change the impulse line? or have a look at the intake boot?
     
  3. motorhead99999

    motorhead99999 Jeepin tree man

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    I changed the impulse line and checked vacuum after that. Also inspected intake boot when I rebuilt it
     
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  4. Stem450Husky

    Stem450Husky Wombat Rancher

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    might not hurt to pull the carb & give it a check over.
     
  5. Jake Wilson

    Jake Wilson ArboristSite Lurker

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    I'd try a carb kit or a new $8 chinese carb off Ebay. I've had pretty good luck with them.
     
  6. HarleyT

    HarleyT Tree Freak

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    Splurge and get the $9.00 one!!!!
     
  7. HarleyT

    HarleyT Tree Freak

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    It comes with the surgical air filter cover!!
     
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  8. albert

    albert Addicted to ArboristSite

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    The fuel tank vent is probably clogged.
    That style vent has burned up more of those saw than I can remember. Old hose and gummed fuel stop them up.
     
  9. Jake Wilson

    Jake Wilson ArboristSite Lurker

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    I already did that and the $9 one that I tried didn't work any better than the $8 one.
     
  10. HarleyT

    HarleyT Tree Freak

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    Nahhhh.
    Have to disagree there...
     
  11. motorhead99999

    motorhead99999 Jeepin tree man

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    I changed it to the new style instead of the grub screw
     
  12. Mad Professor

    Mad Professor Addicted to ArboristSite

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    As far as I know there isn't any "new style', and tubing and grub screws have worked fine for me. 35 years worth of 028 and 038. I had tubing rot on one that was 30 years old but never had one clog.

    Tell me what is this "new style"?
     
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  13. MACHINE

    MACHINE ArboristSite Lurker

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    And check needle setting

    Sent from my SM-G955U using Tapatalk
     
  14. motorhead99999

    motorhead99999 Jeepin tree man

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    The white Check valve style like what comes on all ms series saws
     
  15. HarleyT

    HarleyT Tree Freak

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    Have you got a pic of one of these?
     
  16. motorhead99999

    motorhead99999 Jeepin tree man

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    I’ll wander out to the garage and get one.
     
  17. motorhead99999

    motorhead99999 Jeepin tree man

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  18. HarleyT

    HarleyT Tree Freak

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    That is just a generic Echo/Zama one.

    It works fine, but Stihl has many others.

    vents 001.JPG
     
  19. motorhead99999

    motorhead99999 Jeepin tree man

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    These are the ones they send with any replacement carbs and such. Especially the $9 Chinese specials lol. I havent had one go bad or plug up yet so I use them.
     
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  20. HarleyT

    HarleyT Tree Freak

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    They do work fine.
     

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