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Mastermind meets the Dolmar 7900

Discussion in 'Chainsaw' started by Mastermind, Jan 16, 2012.

  1. nstueve

    nstueve Makita Freak!

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    Would seem like walbro probably has a spec sheet on each carb that would provide this info...???
     
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  2. psuiewalsh

    psuiewalsh Addicted to ArboristSite

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    What about a 390 carb?
     
  3. Mastermind

    Mastermind Work Saw Specialist

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    Yeah Keith, the 390, or 395 carb will work. A 288 air filter elbow is needed to connect the HD filter....
     
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  4. dolmarfan

    dolmarfan ArboristSite Lurker

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    I am a offtopic but here goes:
    Tuning dolmar 5000 with a limited coil.Tuning to keep under the rev limiter(13500rpm) requires H screw 3,5-4 turn CCW and my tach is still reading 13200rpm.I dont think I have a leak.Is this ok?
    Thanks!
     
  5. Mastermind

    Mastermind Work Saw Specialist

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    Probably........

    Those small saws tune sorta weird. Less airflow means more turns out on the H screw.

    I would find the limiter........then lean it out a little more at a time, checking the tune in the cut. As you lift the pressure it should still burble a little.

    Without the rev limiter, that saw would likely still four stroke at 14,500 or so.
     
  6. psuiewalsh

    psuiewalsh Addicted to ArboristSite

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    Good to know. I just put one together and had to dig the epoxy out of the H screw hole. I will test next week and see if it wants more fuel.
     
  7. psuiewalsh

    psuiewalsh Addicted to ArboristSite

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  8. cheeves

    cheeves Tree Freak

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    I've run a lot of big saws in my younger days, and my 79 is as good if not better than any of them!! Just awesome to use!! Sheer Joy!!!
     
  9. cbrduckdog

    cbrduckdog ArboristSite Member

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    Update, I still have this saw in this tread. Its still doing very well pulling a 32" skip tooth chain right now. I need to get some video of it since its what 3 years old now or something.
     
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  10. Mastermind

    Mastermind Work Saw Specialist

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    Hello stranger.

    Good to see you here. :)
     
  11. cbrduckdog

    cbrduckdog ArboristSite Member

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    Yea been real busy first time back here in a while. Work has me all over the world and the US.
     
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  12. mdavlee

    mdavlee Tree Freak

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    Nice to see you pop in. You still got that 066 I sold you?
     
  13. dugide

    dugide ArboristSite Operative

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    should pressure/vac check, sounds like an air leak. L/H should be 1 and 1/2 turns out.
     
  14. Terry Syd

    Terry Syd Addicted to ArboristSite

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  15. cbrduckdog

    cbrduckdog ArboristSite Member

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    Well a someone ran it an offered a Sig 229 DAK and I could not refuse.
     
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  16. mdavlee

    mdavlee Tree Freak

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    I would have kicked your tail if you didn't trade for that.
     
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  17. wde_1978

    wde_1978 Addicted to ArboristSite

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    Nice ! :clap:

    Wish I had any kind of stronger wood to cut to properly check my PS7900 out. :chainsaw:
     
  18. Freakingstang

    Freakingstang Doctor Freakinstein

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    Hey Randy, how do these 7900's compare to a good running 064 that you've done? Ever had them side by side?
     
  19. Big wood1

    Big wood1 Trying to get it right

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    Can you tell me where to get that piston please. Thank you
     
  20. Adirondackstihl

    Adirondackstihl Flyz, Fuel & Fotos

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    7910 piston
     
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