Mastermind Meets The MS661 C-M

[bryanr2]

In other words, I need one?

Sign me up.

 

[Stihlman441]

I'm done with this saw. It's in a box and leaving in the morning. I'm very happy with the way it runs now.

Hang on ya dont get away with that so easy.
Whats the go
Is it better than a 660
Is it werth the hang around for ?
Do i order one ?
Talk to me.

 

[bryanr2]

+1 what he said.opcorn: especially "is it worth the wait"

 

[Locust Cutter]

Sign me up.

You already have a 395 though... What would you need with a 661?

 

[bryanr2]

look at the sig.... need has nothing to do with it.

I dont smoke, I dont drink, I dont gamble, I dont have any recreational toys. I do like tools, outdoor equipt, and I am addicted to chainsaws.Chainsaws are my drug of choice.

 

[Locust Cutter]

I still want a 395xp and no I don't "Need" one either. Of course I need my shoulder to finish healing u so I can give my new to me 9010 a good workout...

 

[Mastermind]

I had to get this saw back to it's owner, I'm sure everyone here understands that. I've had it since early December.

If you like spring AV.......this saw is for you. I like the way it handles better than either a 660, or a 395.....

Even stock it blows the doors off of the 660.....

 

[Trx250r180]

I had to get this saw back to it's owner, I'm sure everyone here understands that. I've had it since early December.

If you like spring AV.......this saw is for you. I like the way it handles better than either a 660, or a 395.....

Even stock it blows the doors off of the 660.....

Would you compare it like the jump in tourque from the 460 to a 461 was ,to the 660 to the 661 ?

 

[chadihman]

Understood. I take your word seriously.

 

[Mastermind]

Would you compare it like the jump in tourque from the 460 to a 461 was ,to the 660 to the 661 ?

Yes, that's a good way to put it. I just hope that the saw suffers no problems.

 

[Mastermind]

Here's my spec sheet for the MS661

MS661C-M

Stock:
Ex: 98°
Tr: 123 - 128°
In: 81°

Ported:
Ex: 100°
Tr: 124°
In: 84°

Cut .030 from squish band
Compression: 180psi
Squish: .023

 

[shootingarts]

Here's my spec sheet for the MS661

MS661C-M

Stock:
Ex: 98°
Tr: 123 - 128°
In: 81°

Ported:
Ex: 100°
Tr: 124°
In: 84°

Cut .030 from squish band
Compression: 180psi
Squish: .023

Said very seriously, I do admire the way you put your numbers out there to share knowledge. Gives others a good starting point. Of course those numbers are far from everything as people found when I gave them the cam numbers off my circle track cars.

Hu

 

[Mastermind]

Port shapes play a huge roll in these engines as well Hu. For instance, on many engines I will not lower the intake by grinding. I like to maintain a high case compression in a work saw, so that transfer velocity is as high as possible. That means that the time between the intake port closing, and the transfer ports opening needs to be kept constant between many models, even though transfer heights vary. Lowering the intake, and raising the transfers can kill some models. The MS461 and the MS661 both appear to be this way. In these saws, I alter the shape of the intake, rather than the height to get the time/area I'm needing.

 

[LegDeLimber]

I still want to see someone make some foam castings of a few ports.
They would sorta look like cores for lost wax casting, just made from something flexible
so as to be able to pull them out when the material sets.

I'm waiting for the yearly termite inspection dude to show up, So yall may get some goofy thoughts outta me.
Guess I should go move some things out of the way instead of reading here.

 

[shootingarts]

Port shapes play a huge roll in these engines as well Hu. For instance, on many engines I will not lower the intake by grinding. I like to maintain a high case compression in a work saw, so that transfer velocity is as high as possible. That means that the time between the intake port closing, and the transfer ports opening needs to be kept constant between many models, even though transfer heights vary. Lowering the intake, and raising the transfers can kill some models. The MS461 and the MS661 both appear to be this way. In these saws, I alter the shape of the intake, rather than the height to get the time/area I'm needing.

Randy,

Thanks for all the additional info. I have to try whittling on a two cycle just for grins sometime but my long term plan, at least at the moment, is to lay hands on a 661 when the money gets right and let you do the full treatment after it has some run time. Everybody needs one pet in their barn!

Two strokes are far more complicated than four strokes. Like a lot of things, less doesn't always mean simpler. I can work on intake and exhaust separately and play a lot of games with a car engine that the saw engine won't let me do. That was what happened with my cam numbers, others didn't realize that everything from my carburetor to my exhaust were built around that cam and those heads. Without those heads and the other things I had done the cam didn't mean much.

The two cycles remind me of a 1911. A 1911 is so simple it took me several years of working on them before I understood them. John Browning was generations ahead of his time.

Hu

 

[blsnelling]

Here's my spec sheet for the MS661

MS661C-M

Stock:
Ex: 98°
Tr: 123 - 128°
In: 81°

Ported:
Ex: 100°
Tr: 124°
In: 84°

Cut .030 from squish band
Compression: 180psi
Squish: .023

What were the numbers you didn't like in the other cylinder? I think you may have shared them earlier, but hate to dig through 60 pages!

 

[Mastermind]

98
122
85

 

[windthrown]

Well, maybe Stihl HQ will read this post and solve their damn problems with the 661!

 

[7sleeper]

Well, maybe Stihl HQ will read this post and solve their damn problems with the 661!

You are forgetting ... it's only the plating from saws on the oversee market...now which side of the see...



7

 

[windthrown]

You are forgetting ... it's only the plating from saws on the oversee market...now which side of the see...



7

Yes yes... I have read some of your posts on der German site. To correct your English though: its overseas, and sea... tough see could be a pun I guess.

Problem with Stihl on the 661 not-a-recall is that they have been like Toyota with all the secrecy, and saying that it is a non-issue, and that the saws are all bad someplace else. I know from reading the domestic and international forums that there were bad 661 saws in Germany, France, the UK, and the US. Dealers here are getting pissed off at Stihl over the lack of information on this issue, either from the distributors or the mother company. Users in the UK, Germany and France are of similar opinion.