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372xp tune help

Discussion in 'Chainsaws' started by Jordon, Jan 19, 2020.

  1. Jordon

    Jordon Well-Known OPE Member

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    I have a ported 372xp saw always ran good. A few weeks ago the clutch broke. Fixed it. Decided to check the plug to see how it's been burning. Plug was black black. Checked the rpm was a little over 12,000 out of wood. Leaned out the h got the saw to 13,500. Seemed way better. But started like it starving for gas til warmed up. Was struggling some in wood. After a tank checked the plug. Had no color. Turned the h ccw. Saw is at 12,450rpm shows a hint of to rich on the plug. I'm frustrated. Any help? It's a 372xp oe. Ported decked cylinder 8pin rim. Unlimited coil. 20in bar. big 1in piped mufflerShould I start over on carb setting? What should setting should I start at L,H ? To get started?
     
  2. Stump Shot

    Stump Shot Disciple of Monkey's

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    Start with the low speed screw, lean and richen it until it stumbles in the middle of this is where you want to start, I like it a hair to the rich side here. Check for acceleration. Now set the idle speed to less than clutch engagement about 2,700 to 2,900 rpm. Once the idle is all taken care of you can move on to the high speed adjustment. Forget the tachometer, go put it in a log and listen for it four stroking when you pull out of the cut and disappear when you resume cutting. If it's four stroking while cutting it's too rich, if it's not four stroking at all it's too lean. Once you get this worked out you can dig that tach out again and see what your proper tune is.
     
    MG porting, Ronaldo, P.M.P. and 4 others like this.
  3. huskyboy

    huskyboy Sorta a Husqvarna guy.

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    Your L is a probably a touch lean, give it 1/8 turn richer (counterclockwise). 13,500 is usually plenty safe on pretty much all 372xp stock or ported. You could probably go a bit higher. But make sure it holds tune after a couple cuts and still 4 strokes out of wood.
     
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  4. old guy

    old guy Love me some Husqvarna

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    Try richening the low till it starts better, that will also richen the high a little, go from there.
     
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  5. Jordon

    Jordon Well-Known OPE Member

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    Ok thanks I'll try it out. And get back with ya. Thanks guys for the help. Jordon
     
  6. Jordon

    Jordon Well-Known OPE Member

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    I'm gonna start over tomorrow with the carb. From seat where should I turn out the L and H screws to get started. Right now it idles at 3800. I'm gonna start over
     
  7. mdavlee

    mdavlee Hillbilly grinder

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    1 turn on both is going to get you close
     
  8. Jordon

    Jordon Well-Known OPE Member

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    Finally got to try out the 372xp today and mess with the tune. Started all over. L screw is now 1/1/4 turns out. H screws is a a hair over 1 turn. Checked it in wood ran good no bog,no smoke,no struggle. Ran a tank thru it then checked with the tach. Idle is 3200. Goes to 13,150 outta wood. If I lean the H more won't be far from seat. Being a ported saw. Figured it would go higher in rpm? I dunno I guess I'll leave it. Pictures are my test tree I dropped yesterday. Dead ash
     

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  9. 5000+

    5000+ Super OPE Member

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    Did you check and clean the air filter first?
     
  10. Jordon

    Jordon Well-Known OPE Member

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    Yes I installed a brand new filter
     
  11. NPKenny

    NPKenny Super OPE Member

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    3200 at idle is a bit fast for me. You might need to open up the L screw another 1/8 turn. Or get it to idle a touch lower with the idle screw. Chains usually sneak forward at that idle speed in my experience.
     
  12. huskyboy

    huskyboy Sorta a Husqvarna guy.

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    Carb limiters removed?
     
  13. Jordon

    Jordon Well-Known OPE Member

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    Yep they are removed. Chain doesn't move. Idle is now set at 2900. Still can't get over 13,150 outta wood
     
  14. Jordon

    Jordon Well-Known OPE Member

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    Unless I lean more on the H screw. Will be a half turn out from seat in order to get I4,000 or more
     
  15. MG porting

    MG porting Pinnacle OPE Member

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    Sounds like you need a carb kit the way you have the carb settings don't make sense is the high idle screw been touch you might want to back that out and then ree do the low side of the carb.
     
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