It's here!!!!............Inside the MS661

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My point of this is going to be that really noone is superior to the other..its not randy vs brad..stumpy vs dan..well maybe if a second or two decides your decision then maybe it is , but all in all the average blue collar turd isnt gonna notice the seat of the pants difference..im not a saw builder..im a saw user..and i change my own muffler bearings myself..ive had guys PM me that cut 5 cords of firewood a year so concerned over a second in a cut..why i have no clue..i think its best to roll with whoever your cool with..to say one is soooo much better than the other is ********..it really is..im a person who just does my thing..i dont really feel the need to impress anyone , and laugh at those who do..its all in good nature with me..i wish some of these dudes would just let it go and do them instead of tryin to show who has a bigger crank.

:clap::bowdown::clap::bowdown::clap::bowdown::clap::bowdown:
 
The only way to really test this popup vs cut squishband thing is to take a strong saw with a popup and run it on the dyno. Then replace the piston in that saw with a flattop, cut the squishband to result in the same compression, re-port to the same timing numbers, and re-dyno it. Anything less, and you're testing variables other than popup vs cut squishband. I've built 346s both ways and my popup saw was faster...measurably so.
 
Brad, modding my saw with a popup; my largest fear is that in 15 years, my saw will need a new piston. If I sent you a saw to modify, could you make a second piston for it (in case I need it in the future) ...... and how much more would you charge (aside from the cost of the piston)
 
Brad, modding my saw with a popup; my largest fear is that in 15 years, my saw will need a new piston. If I sent you a saw to modify, could you make a second piston for it (in case I need it in the future) ...... and how much more would you charge (aside from the cost of the piston)
You make an excellent point. I don't know how many times I've seen this as a reason to not use a popup. Seriously? How often are people replacing their piston? They're not. You provide the piston, I'll turn it for free for any saw that I built.
 
You make an excellent point. I don't know how many times I've seen this as a reason to not use a popup. Seriously? How often are people replacing their piston? They're not. You provide the piston, I'll turn it for free for any saw that I built.

That says a lot Brad.
I may have to re-consider my 661, and see about getting me a piston for it.
 
Don't worry Bud. In fifteen years we'll find something even better than pop-up pistons.
Yeah, maybe so, but for now, I am liking the idea that there is a choice between cutting squish and cutting the piston ..............
I aint racing or competing, so to me its all about longevity.
Something happens to a cut squish saw and they can get a new piston, probably clean up the cylinder, re-assemble and go
Getting the extra piston cut now, then having something happen puts me in the same boat;

- I am still purchasing a piston on either one
- I can probably re-use the same cylinder on either one
- I can easily have the saw up and running in less than a few hours on either one

My only question now is how is the top ring holding up in a popup saw ?
(I am willing to wager that it is seeing some more action due to the cut piston, but from seeing all of the posts from guys with saws out there running pop-ups, nobody has posted up anything detrimental with their top ring.)
 
Yup there's more flutter and the groove sees more pressure. But the additional turbulence blows out the cobs better. Carbon is the real killer of two-strokes.
 
got to use my 661 with the 42" today...wow...was able to really lean on it and it never bogged down. I wasn't expecting this as the 28" bar did bog if pushed in the same wood, smaller rounds.
green Eucalyptus, white gum (larger stuff has pink heart wood)
stihl 404 42/41" bar (13t tip sprocket), 52AJ (now round filed) full skip, 7t sprocket
chain had a couple light sharpenings on it but hadn't touched the rakers...still throwing good sized chips, however
After the one round (about 45" diameter) I dropped rakers a few thousandths...haven't tried it again yet.
running new RS full comp on the 28 with 8t sprocket (small tip bar, 11t)
I've opened up the single muffler port about 50%

I'm thinking this thing was more engineered for big bars rather than smaller. My '92 066 'red-eye' is a lot faster and stronger with a 24" or 28" than this new saw. (just a muff mod/dual pt)
 
My 395XP is headed back to Illinois where it came from. Stihlaficiando sold it to me and now bought it back. He also has that very strong running 661 I built for him. His reports on the 661 are extremely favorable. Lots of torque and more topend than a 660. I would concur with that assessment. Since I never got around to it, he's agreed to do a heads up comparison on them. Yes, I'm putting you on the hook, Mark! :)
 
Well bradley , its true..99.9% of the members here who piss on a cold day have a crank that looks like an olive in a wizards robe..or they wouldnt be into chainsaws.

I'll be damned. This explains everything. Next time somebody asks me why I like chainsaws so much I will have an intelligent answer.
 
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I ordered the dual dawgs for the R model shortly after receiving this saw. They were on back order for several weeks. They came in earlier this week. While package correct, I unfortunately received two inner dawgs. I order two outer ones. I went ahead and installed the inner dawg this afternoon. I was curious to see if it extended lower to better support a long bar. I'm happy to report that it does. I find it interesting that the R model dawgs are actually smaller than the standard dawgs. I'm OK with that though. I'm most interested in better supporting a longer bar. I will wait until I have both dawgs before mounting a bar.

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Here are the West Coast flavour
 
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