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Mastermind meets the Dolmar 7900

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

  1. SawTroll

    SawTroll Information Collector

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    According to the Walbro part list, the HD-12 is 17.46mm, while the HD-6 is 16.67.
     
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  2. Trx250r180

    Trx250r180 Saw polisher

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    now that you have raised the bar with the 7900 ,you will just have to start building stronger 372's and 440's :popcorn:
     
  3. Mastermind

    Mastermind Work Saw Specialist

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    Finger porting a 7900 right now..........
     
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  4. Adirondackstihl

    Adirondackstihl Flyz, Fuel & Fotos

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    Smell your fingers...........:hmm3grin2orange:





















    :poop:
     
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  5. Hedgerow

    Hedgerow HACK

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    Never would have thought to do that...
    But hey, why not???
    You going with the stock carb? Or un-decided?
     
  6. Mastermind

    Mastermind Work Saw Specialist

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    372 carb
     
  7. Hedgerow

    Hedgerow HACK

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    Good call... Can't wait to see it run...
     
  8. Mastermind

    Mastermind Work Saw Specialist

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    We're doing two.......this first one is being a complete pain in our asses. Jon's about ready to chunk it in the woods.

    He just tore it back down to check everything.......it appears that the intake boot isn't sealing at the carb base.
     
  9. Metals406

    Metals406 Granfodder Runningsaw

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    Welcome my brother. . . You are now part of the Society of Finger-Porting Addicts. . . Resistance is futile.

    :laugh:
     
  10. Metals406

    Metals406 Granfodder Runningsaw

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    Duct tape? :popcorn:
     
  11. Mastermind

    Mastermind Work Saw Specialist

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    ####ty design me thinks. :hmm3grin2orange:
     
  12. ptjeep

    ptjeep Addicted to ArboristSite

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    Uhhhhhhh............... We're gonna need some vids of that one!:msp_w00t:
     
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  13. Mastermind

    Mastermind Work Saw Specialist

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    If it ain't a turd I'll have at Jer's GTG.
     
  14. Hedgerow

    Hedgerow HACK

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    Poor Jon...
    He needs a raise..
     
  15. Mastermind

    Mastermind Work Saw Specialist

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    For sure. :rock:



    We're using a 372 intake on ours......
     
  16. Jimmy in NC

    Jimmy in NC Addicted to ArboristSite

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    Tell Jon I feel his pain right now.. got a 372 that wants to fight me right now.
     
  17. cgraham1

    cgraham1 I feel old

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    I'm thinking about sending my Dolmar to Randy, thought I'd bring up an old thread. Anybody else have their 7900 Masterminded? I'd love to hear some feedback... the pics and videos are gone from this thread. :(

    The kill switch thing makes me laugh, you can just pop it out and flip it over and then it's the same as a Husky! :laugh:
     
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  18. Mastermind

    Mastermind Work Saw Specialist

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    I remember this saw very well. I was at Terry's last GTG.....eating a hot dog. I hear a saw fire up, and make a few cuts. I could tell it was turning incredible RPM in the cut......so I got my tach and checked it. Nearly 12,000 RPM in the cut !!!!! My 372XP was turning about 100 less RPM......and I thought it was pretty mean.

    I asked the guy......."who ported this saw?"

    He said you did Randy.....about three years ago.

    Welp.......I dug thru my notes.....and that saw was the saw in this thread.

    It has a new OEM top end with the lightweight slab sided piston....nothing special in the port work. No carb work or anything.

    I have my notes on it.......and still do every 7900 the same way. I just cut the squish now instead of doing a popup piston.
     
  19. Mastermind

    Mastermind Work Saw Specialist

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    And here it is......

     
  20. cgraham1

    cgraham1 I feel old

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    Looks like it runs pretty good! :bowdown:

    I'm sure this has been discussed before, but... How do these saws compare to other ported saws in the same class, like the 372 or the 460/046? Or the 064 since you're already doing one for me? :D
     
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