Stihl 661 vs Big Bore 064

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Published 2019-09-08

Here we are watching the same 661 as seen in the previous 661/066 build sequence videos running against my newly upgraded 064.
I used a standard oem 660 cylinder assembly for this project.
Upon review of the dialog, I noticed a qualification was needed regarding the commentary about the differences in the combustion chamber work. The 661 chamber was reshaped along with the flow tricks added in. I did do the flow tricks to the 660 cylinder for the 064. I did not reshape the combustion chamber however.
As mentioned, there is a 1.2 pound difference in weight between these two when fully fueled.
Timed runs as follows:
661 @ 13,080 rpms 12.78 & 11.00
BB 064 @ 13,080 rpms 13.70 (cut out) 13.76 & 12.17
The 661 have some more work done and runs a little faster. The 064 runs a little slower but weighs quite a bit less.
I well pleased with the outcome of the 064 in BB trim.
I am currently available for custom saw modifications. please shoot me an email if you are interested.
[email protected]
Thanks for watching.

All Comments (18)

@TonaldDrump686 4 years ago

That is some sharp chain.
@outinthewood3578 4 years ago

That 661 is quite the runner ! Check your mail it has good news !!
@prescribedfire1953 4 years ago

Jack how do you decide on what the unloaded WOT should be? I don’t have a tac so I tune by ear.
@johnclarke6647 4 years ago

What kind of tachnare you using andbwhere did you get it?
@michaelremski8295 4 years ago

So how did the 2 saws feel in the hand? Listening to them in the cut sounded very similar, did they feel the same? Not meaning "how fast" but did either feel like it bogged down if you pushed too hard? Thank you again.
@richherman4257 4 years ago

I have a 064 that needs to be rebuilt and I don’t have the time to do it myself I wanted to see about you porting it too after it’s running if your not too busy
@farmerjackson709 4 years ago

Where did you get your tachometer from?
@topchoppers7980 4 years ago

Hey hotsaws101 I'm looking for a better saw any chance you would be willing to build a saw either from stock set up or even a ground up build please let me know great vids, and God bless
@maninaboysbody 4 years ago

What do you think of the MS500i ??
@andrewotero1972 4 years ago

Got a few 64 's on the bench are you using a OEM cylinder or a am cylinder? I've used cross performance big bores on my 64's in the past they worked up pretty decent with a little bit of decking. Great videos I'm always looking at ways to get a little bit more performance out of the saws haven't dealt with the 661 hard to get away from those 066 660 and 64,s 😀
@98fishingfool 4 years ago

You wouldn’t happen to have a dual key flywheel for the 064 ?
@kylemueller8906 4 years ago

With all your time on a 064, have you ever had a crank break or have seen one that has.
@ericwyke155 4 years ago

Hi Hotsaw101 in this video you made a comment oil oil oil and the fuel ratio for saws that has mTronic which is stoichiometric ratio do you still run Motul @ 50:1? Because the stratified engines run stoichiometric ratio’s do you think that it would be better to run a lower percentage of oil right around 44 : 1What is your comment thank you very much
@woos31 4 years ago

1 pound of saw makes a HUGE difference in a man's decision making process when full fatigue has set in.............. ... your vision narrows along with awareness, you get lazy and don't get as far out in the clear as you should, so then you start short cutting all of your processes. That is the trifecta of a timber cutter to get his logger's reward and not going home........ On a positive note, thank you Mrs. Jack again for assisting in "big kid time" lol! Where would we be if not for your help in this 1 ton hotrod saw update as well as making my bill fold quiver as I begin my firewood cutting, making thoughts of hot rod saws rampant in my mind.
@joshmoulson9372 4 years ago

Afternoon Hotsaws101, regarding the noticeable difference in weight... Is it just me or are the modern saws getting heavier than the 'old skool' saws? For example, the 036 and the Ms361 are lighter than the modern counter part the Ms362 with noticeably less longevity and power. I'll put it out there and say the new saws go faster, but do less and you can't beat old skool cool. Love the work you do with saws, thanks for the showdown.
@robertshoemaker6204 4 years ago

Ran many a 064s back in the day replacing our 056 mag II....was lighter but had a glass bottom end kept breaking them, then the 066...much better design bottom ends much improved...same with 084/088 same thing.....Shoe
@voxpopuli905 4 years ago

I have an 064 and I think it possibly runs even better than that one