weedkilla
Ain't no guru of nuthin'
Thanks Randy. It's been said dozens of times, but these are great threads. Always a massive help, or at the least fascinating to a spectator.
Makita 6401 to 7901 Plus porting the 7900 and the Solo 681
- Thread starter Mastermind
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Mastermind
Work Saw Specialist
No one really asks many questions anymore.....
Did you have a good day?
You can see the 1mm thicker flange for the longer stroke on the 681. I'd like to find another one of those saws.So, we have two Dolmar 7900 cylinders, and one Solo 681 cylinder here. Can y'all tell which is which?
Mastermind
Work Saw Specialist
I did. Thanks for asking........you are true and dear friend.
I'd already cut the bases on the 7900 jugs, but you are right Brad. The thicker base is very noticeable.
weedkilla
Ain't no guru of nuthin'
That "nub" on your flat plate when you're cutting the squish. Is that just a bit of loose round stock?
The new lathe is in and turning. I have to pluck up the courage to cut a squish band one day soon.
Would you suggest a 550 or an oe346 is a better candidate for a hack?
Mastermind
Work Saw Specialist
Mastermind
Work Saw Specialist
That's just a piece of 1/2" drill rod. I've got a few in different lengths.
The 346 will give you more experience with the port work. The 550s I do just get a little work on the exhaust and the uppers. The rest is all machine work.
Thank you, I need to start acquiring some smaller tooling, 2" bar don't fit in most cylinders.
bryanr2
Addicted to ArboristSite
weedkilla
Ain't no guru of nuthin'
Upper transfer shape still leaves me scratching my head.
It's most of the reason I read these threads at the moment, trying to get my head around flat vs tapered, roof shape, direction, what works for different saws and perhaps why.
Full Chisel
Slingin' Stihls and runnin' Huskies
I've heard about dem Solo Saws...
Deets066
Firewood hack
Is the 681 different bore than the 7900?
David Young
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So what your thoughts on the lower transfer?The 681.
Now a 7900.
See the differences in the lower transfers?
The uppers look wider on the solo
What numbers did the doom are have.
Why do the have so much intake timing and low transfer and exhaust numbers
Mastermind
Work Saw Specialist
No, they are both a 52mm bore.
Poleman
Addicted to ArboristSite
Randy,
Do the opened up lower transfers on the Solo? And would doing that to the Dolmar help??
What piston is the Solo running ? Open port or slab side? What would the effects be putting the closed slab side Dolmar piston in the Solo if it's the open piston.
Just thinking out loud....
Do the opened up lower transfers on the Solo? And would doing that to the Dolmar help??
What piston is the Solo running ? Open port or slab side? What would the effects be putting the closed slab side Dolmar piston in the Solo if it's the open piston.
Just thinking out loud....
But we still enjoy the build threads by you and others. Thanks for taking the time and effort to do them.
Deets066
Firewood hack
Will the 7900 accept the 681 jug?
The Solo 681 would easily have the highest BMEP of any saw on the market. While many only consider a saw from the major two, its mind boggling what gets left behind. A 576/461 would not touch an 'off the shelf' solo 681 without significant modification. The difference l like between the 7900/681 lies not only in extra zip of the 681 but a host of little imorovements in minor detail all over the saw. lts not untill you get both saws on a bench together for this to be evident. Thanks again M/M for reviving this place and keeping it alive!
