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MS 441 WITH BIG BORE NEW POT.

Discussion in 'Arborist 101' started by Phill Cresswell, Dec 20, 2016.

  1. Phill Cresswell

    Phill Cresswell ArboristSite Lurker

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    Can any one help,I have rebuilt a 441 with big bore po and piston, the saw starts fine ticks over fine but under no load at hi revs the revs are not regular, it is as if it wants to scream but then hesitates, is this normal when a big bore is fitted.
     
    SeMoTony likes this.
  2. SeMoTony

    SeMoTony ArboristSite Guru

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    I expect that you have done a pressure/vacuum test, using new plug, have double checked all torque values on removed replced engine fasteners.
    I haven't read about BB on 441; on 660's there is an ocassion of free line of site thru exhaust under piston tdc which isn't sposed to do much bad. The real experts will show up with more experience to draw on.Good luck straightening this saw out.
     
    Wrenchbender16 likes this.
  3. Phill Cresswell

    Phill Cresswell ArboristSite Lurker

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    Thank you very much indeed for your reply, does this iregular reving at hi revs under no load sound normal and un damaging, i have also checked all you mention and all seems good.
     

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