Stihl ms400R vs ms661R - The Short Bar Session

Filmed in May, 2022.
As mentioned, WELL used chain. From a tree killing sabbatical over on Mr. Ryder's compound. It's Carlton A2 chain (purchased by Blount Corporation) - which is the supplier for Bailey's and their "Woodsmen Pro".
Also as mentioned an old Tsue 30" bar that I have had for several decades. Still in pristine condition.
I've done a lot of testing with a couple of 400s at this juncture. They are not available as wrap version from the factory. I had fitted the 362 wrap upgrade kit onto this saw .It's been fun and tedious. Enlightening and lengthy. 3 topend assemblies. Various air filtration choices. A magnitude of saw-offs & a felling adventure. Some of which has made on the channel at this point. You just "gotta love" real-world R&D!
This is the first saw-off session between these two.
The ms661R is a standard. Coil limited high idle to 13,320. Bone stock.
The ms400R C-M is at the Psy-Ko S level of zippkitting - stage 5.5 in essence. 14,040 coil limited.
I talked about the factory rated HP & displacement comparison:
661s come in a 91.13cc with a 56mm bore x 37mm stroke. 7.2 HP.
400s are 66.76cc with a 50mm bore x 34mm stroke. Rated at 5.4HP.
Weight comparison:
- On my less than Weights & Measures" accurate bathroom scales -
The 661R Magnum weighs 19.2 to 19.4 pounds with fully laden tanks.
The 400R C-M tips the scales consistently at 15.4 lbs., tanks laden.
Differential comparison:
The 661 is up by 24.37cc over the 400.
The 661 is up by 1.8 HP over the 400.
The in this session the 661 outweighs the 400 by 3.8 pounds. That is a lot of extra mass. It becomes more noticeable ~ mid week when a guy is on gnarly and/or brushy ground...
The 400 had the worst of it in this session. Nearly 2" wider cut in the first run. The "whatever this is" in the center of the log in the 3rd & 4th runs had an interesting look - at lot like a knot. You can hear the 400 lose some rpms when it gets to that point in the cut.
Timed runs:
400 @ 14,040 am filter #1 went 10.60 down and 10.78 up.
661 @ 13,320 went 8.91 down and 9.05 up.
400 @ 14,040 am filter #1 went 10.15 down and 10.24 down.
400 @ 14,040 am filter #2 went 10.14 down and 10.98 up.
I think that the two runs in the middle were the closest as far as diameter & consistency of the wood. The "whatever that is" becomes more prevalent in the 3rd run. Clearly the 661 had the bye in this session.
At this stage of zippkit, along with the aid of a better flowing air filter, the "little saw that could" makes a respectable showing against the 661R Magnum. I "might just be" magnanimously pleased in the end!
At the time of your viewing this, I may, or may not, be immediately available for custom saw modifications. I am booked out several months regularly. If you are interested in having a saw zipped, please shoot me an email. That is the best, first point of contact.
[email protected]
Thanks for watching.