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How do I tune this saw?

Discussion in 'Chainsaws and Power Equipment' started by bobdog2o02, Jan 26, 2016.

  1. clemsonfor

    clemsonfor

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    Nope? And also with a muffler modd you no longer have a stock saw either? You can get exhaust out easier and can pull air in easier so now you need more fuel. This may equate to more RPMs and maybe not? I am no super expert.
     
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  2. bobdog2o02

    bobdog2o02

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    Roger that, so the consensus is that the H is rich... I'll work on that tomorrow. Ill share another video after i work on it without the intro and backstory. I'll also try to remember to set the camera to FHD 1080P....
     
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  3. 94BULLITT

    94BULLITT

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    You probably want it to turn around 14,000rpm out of the wood.
     
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  4. MasterMech

    MasterMech The Mechanical Moderator

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    Def a tad rich... But sounds beastly for a 38cc....
     
  5. MasterMech

    MasterMech The Mechanical Moderator

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    :rofl: :lol::rofl: :lol::rofl: :lol:

    Is this a real thing? I have a hard time wrapping my head around how that works with a fuel pump in a diaphragm carb...... Constant pressure under the metering diaphragm is maintained by the pump and regulated by the inlet needle spring. It wouldn't change unless it was starving for fuel, either a pump issue, clogged filter, pinched/leaking line or just plain out of fuel....
     
  6. clemsonfor

    clemsonfor

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    Is this maybe something from an oldschool partial gravity fed tank or something?
     
  7. colin.p

    colin.p

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  8. bobdog2o02

    bobdog2o02

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    Here we go again.

     
  9. saskwoodburner

    saskwoodburner

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    I think you've got it bout near perfect. Little bit of bounce in n out at the start of cut and then cleans up.
     
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  10. clemsonfor

    clemsonfor

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    Yep like saska said close if not perfect. Not sure if the times it went back to 4 stroking you let up on pressure or just the saw so I can't say for sure. I personally would leave it where it is and run a few tanks through it to seat rungs well. And if you still getting that swap from 2 to 4 stroke with constant pressure turn the H screw in just a tad and see what you have. A touch more fuel in break in is not a bad thing.
     
  11. bobdog2o02

    bobdog2o02

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    I noticed it happening too and I think it was the chain being extra grabby for the smaller displacement saw. I put a real good edge on it just before starting to cut those cookies.
     
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  12. clemsonfor

    clemsonfor

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    Well if you think thats the case I would leave it as be. I dont think its too lean so I wouldnt worry there.
     
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  13. bobdog2o02

    bobdog2o02

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    Thanks everyone for their input and feedback. I'm a happy boy having put a new skill in my back pocket. Now for more practice, cue up the CS-400.
     
  14. 94BULLITT

    94BULLITT

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    Try tooning a saw with a full tank and see what happens.
     
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  15. 94BULLITT

    94BULLITT

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    I think it sounds good. Now if you want to fine tune it you can make small adjustments and time your cuts to find where the saw performs the best.
     
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