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Stihl 046 tuning

Post in 'The Gear' started by 69911e, Nov 29, 2012.

  1. 69911e

    69911e Member

    Joined:
    Oct 29, 2010
    Messages:
    73
    Loc:
    CT
    What is the best way to tune my saw; 046 MAG, dual port, big bore? I think it is an 82.5cc now.
    I have done 2 methods at WOT;
    1: Rich'n it out until it burbles. The burbling method had the engine running at 14K.
    2: Set max RPM to 13K using and oscilloscope.

    Also, should I decrease the max RPM due to the heavier piston and subsequent stress on the crank and rod?
    It cut good at both of the above settings. I love this saw and want to make sure I tune it right so it will last.

    Thanks
    Ed

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  2. amateur cutter

    amateur cutter Minister of Fire

    Joined:
    Aug 20, 2010
    Messages:
    1,170
    Loc:
    West Michigan
    I'd run @ the 13K setting if it were me, If I wanted a little more chain speed, I'd put an 8 pin rim on it. Mine cuts like a mother with the 8 pin, & it isn't modded.............................................. Yet. A C
  3. MasterMech

    MasterMech Guest

    Another vote for the 13K setting. Those max RPM specs are given considering the strength of the engine internals. While the saw may run great beyond that, as you stated, that's even more strain on the bottom-end of that motor.

    Exception is that if you hear the saw four-stroking (burbling) while cutting, then I'd go ahead and lean it out a bit.
  4. 69911e

    69911e Member

    Joined:
    Oct 29, 2010
    Messages:
    73
    Loc:
    CT
    Thanks for the info, I will leave it at the 13K.
  5. 69911e

    69911e Member

    Joined:
    Oct 29, 2010
    Messages:
    73
    Loc:
    CT
    What chain type would you suggest for the 20" bar? Standard RS(C) , Skip, or other? I have the 8 pin sprocket.
    How about filing non-standard. I have been filing the rakers down about .020" more than the Stihl depth gauge indicates to get more bite as it has plenty or torque. Good idea or not?
    I also need to get a larger bar for the infrequent larger trees. Any opinions on weather I should get a 28" or 32"? What chain type suggested for these larger bars?
  6. MasterMech

    MasterMech Guest

    33RSC-72, Yellow-label full-comp chisel chain. Semi-chisel (33RMC-72) for dirty wood.

    If you're comfortable with that then I'm ::P. ;)

    How big are these trees? Will a 28" reach across or from both sides? If not then there's your answer. I'd do a semi-skip or skip chain on 28"+. Really depends on the wood.

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