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Husqvarna 372xp Chainsaw carb setting

Discussion in 'Chainsaw' started by mplogging, Jan 22, 2011.

  1. mplogging

    mplogging New Member

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    Hi all
    new to the forum, just registered.

    We run a small firewood business in North ireland, we have two saws a Husky 372xp and 254xpg.

    The 372xp has recently had a seizure , due to old age, the crank bearings were replaced and new piston and clutch.

    The saw now seems to be running too rich, idles perfect but when under load the drowns a bit, a bit smoky too.

    Anyone have a guess what this could be , if needed i could post a video on the site, to show whats happening.

    were runnning 25:1
    1hr on new piston and rings
    checked the pipe from crankcase to carb
    installed new fuel line
    air filter cleaned
    regards
     
  2. RVALUE

    RVALUE Arboristsite.com Sponsor

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    The shop may have it rich for break in. Run a couple tanks then ease it down a bit.

    Then listen to the real experts here.

    :)

    Maybe 25:1 is too rich.
     
  3. komatsuvarna

    komatsuvarna Arboristsite MVP

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    Welcome to the site.

    JMO, I think 25:1 is a bit too rich. I run 40:1 in my saws with synthetic oil. I would think that 32:1 would provide more than enough protection.

    If the saw is bogging and smoking in the cut, it does sound like its need to be leaned out. Turn the H screw clockwise a little bit and make a cut. Keep adjusting till you get it right. Id adjust it to just where it cleans up in the wood. I don't know if your 372 will have a rev limited coil or not, but if it don't it would be easier to tune it by ear than in the wood.I think so anyways.
     
  4. mplogging

    mplogging New Member

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    info on H/L screw on 372xp carb

    Hi

    thanks for the info,

    Today while useing the saw it was using a lot of fuel, more than normal.... as stated above do i only adjust the H screw or the L screw. The carb is a walbro, somebody told me to adjust the saw under load is this necesary.

    regards
     
  5. oscar4883

    oscar4883 Addicted to ArboristSite

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    If it starts well, doesn't hesitate to take throttle, doesn't puddle fuel at idle, etc., I would leave the L side alone. If it is crazy rich, sounds like it is, lean it out so it cleans up well in the cut. Make sure the wood size you tune in is appropriate for what the saw will be cutting. You don't need to turn the screws while cutting if that is what you mean by "under load".
     

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