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Stihl 026 Issue - Suggestions?

Discussion in 'Chainsaw' started by Boundaryh20, Oct 24, 2007.

  1. Boundaryh20

    Boundaryh20 ArboristSite Lurker

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    Hello all:

    Was trimming trees in the yard over the weekend when this issue developed...the saw will run well for a few seconds...then seem to "lean out" like it is running out of gas (by rev'ing high) and then run out of gas and quit while trying to cut. Wait a few seconds, the saw will start and then repeat.

    Basicly, I think that the saw is not being fed enough gas and this issue occurred rather suddenly.

    Suggestions for a fix? I was considering blowing out/replacing the gas feeder tube the supplies the carb. Should I just re-build the carb?

    This has been a great saw...bought it new back in '93ish.

    Thanks,
    Bryan
     
  2. PES+

    PES+ Addicted to ArboristSite

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    Check your impulse line and fuel line for cracks
     
  3. davefr

    davefr Addicted to ArboristSite

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    How old is the saw?? This sounds like either a deteriorated fuel line or clogged filter. Look at the fuel line very carefully. There can be cracks that are hard to see.

    Do this before any carb work.
     
  4. Del_

    Del_ Tree Freak

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    Don't keep running your 026 lean......it is going to destroy the piston and cylinder!
     
  5. 2000ssm6

    2000ssm6 Stihl User

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    Pest has said some good checks. Try those first.

    Do you think your carb may be off? My 026 had the 2 screw carb(idle, and L). I needed a new carb anyway so I got a 3 screw to mod the muffler. My saw would not run even after a carb rebuild.....with the new carb it runs great!!!:cheers: :cheers:
     
  6. Lakeside53

    Lakeside53 Stihl Wrenching

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    The impulse line is a great place to look, but I rarely find a problem with them on the 026. Even the fuel lines seem to last for decades.

    A carb doesn't just suddenly need rebuilding. You have an in-tank filter, and and inlet screen filter. If the tank filter has been neglected (or it's a POS zama filter), the inlet screen may need to be cleaned. If that's blocked, often all you need to go is clean that.

    Fuel: Check your fuel filter, fuel line, carb INLET screen. The best way to test your fuel line is to pressurise it from the tank end.
    Impulse: implulse line, seals, crankcase integrity.

    Remove the carb, put a small blob of grease on the impulse line end and crank over. If you have crankcase vac, it will suck in / pulse. If you don't, the maybe the line and then seals... I'd verify with a pressure test to make sure it's not the cylinder head gasket etc.. If it is a seal it's almost always the flywheel side.


    BUT.... your symptoms also could be tank vent. Next time it happens loosen the tank cap and and see if it comes to life.
     
    Last edited: Oct 24, 2007
  7. max2cam

    max2cam AboristSite Guru

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    I'd also check the gas tank vent. Sooner or later they clog up but it's a simple cheap fix.
     
  8. Boundaryh20

    Boundaryh20 ArboristSite Lurker

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    Thanks!

    I finally got to this project today...ya know...wife/kids/dog/life!
    Took the carb off and cleaned everything I could. then blew out everything I could and cleaned the fuel filter. Now it is running great. Still not sure exactly what was wrong.

    BTW, what does the carb 'plug' into? There is a 90 fitting coming off of the carb that slides into a black rubber hose/fitting(?) on the lower right side. What is the purpose of this?

    Bryan
     
  9. adkranger

    adkranger Addicted to ArboristSite

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    :clap: :clap:
     

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