ported 661 baffle in muffler vs baffle out

[awol]

looks like some kind of ohio hard wood to me.

Hah!! Somebody out there in TN called that kinda stuff "Ohio Hickory". Here in the Ozarks we just call it "foam" wood.

 

[tree monkey]

If you port the cylinder far enough you eventually you have a cylinder that will outflow everything around it,bigger carb didn't seem to help but less muffler outlet fixed it.

The way the muffler is when you get a saw from me is the way it has to be,pull the screen and kill it.

My 066 that Shaun ported was that way,it is a beast but pull either screen and you will notice it loose power and pick up idle trouble.
I put a 1" wb on it with a 880 boot and it didn't run one bit different.
The cylinder is simply maxed out.
You have ran that saw dan.
You have ran the unicorn and it's no different.
Pull the screen on it and you will hurt it.

interesting, maxed out. huh

 

[T.Roller]

interesting, maxed out. huh

To the max

 

[Coltont]

I have a 661. Runs good. I like it. Lots.

 

[jmssaws]

interesting, maxed out. huh

I never said maxed out.

 

[jmssaws]

I built his 395 a couple weeks ago so I'm pretty sure I know how it runs.

 

[jmssaws]

It's certainly not to much timing,when I load it it stops.
To much timing is the opposite plus I put it back to stock and it didn't do it as bad but only because it's not as strong.

Once it's warmed up good it stops,it has to be on the limiter.
It pops at 13.1k
The 6 others I've ported like it popped at 13.1k

 

[jmssaws]

looks like some kind of ohio hard wood to me.

Dead white oak and it's solid but not rock hard but it's all I got.
Will it be less strong in different wood?

 

[T.Roller]

I built his 395 a couple weeks ago so I'm pretty sure I know how it runs.

Ok

 

[jmssaws]

I did cut the baffle out earlier, seems louder

 

[Moparmyway]

I'm 100% positive that the popping through the muffler isn't from timing.

@tree monkey, we've discussed this, I've done everything that I know of, (and I know @jmssaws has too) plus everything that anyone else has suggested to try to find the root cause of this. It's the mtronic, and if it were timing, my saw and probably a half dozen others would have been damaged or destroyed already

 

[Coltont]

I'm 100% positive that the popping through the muffler isn't from timing.

@tree monkey, we've discussed this, I've done everything that I know of, (and I know @jmssaws has too) plus everything that anyone else has suggested to try to find the root cause of this. It's the mtronic, and if it were timing, my saw and probably a half dozen others would have been damaged or destroyed already

Hey you had your hands on my saw!!!! It kinda pops a little but not bad.

 

[jmssaws]

If we can agree that it's limited then what's it supposed to do when it hits thr limiter?

 

[X 66 stang347 X]

Was that a 8 pin? How's does a 9 do on it

 

[awol]

It's definitely not the mtronic doing it alone, because the 066/064/390/395 will all do it if you go to far with the ignition advance. The odd part is, some will jerk the rope out of your hand but still not pop, and some start super smooth but still pop! I think it all has to do with dynamic compression, advance curve built in to the coil, and some other things I ain't figured out yet.

 

[jmssaws]

Was that a 8 pin? How's does a 9 do on it

8pin
I left my 9pim on Sondre's 395 but he mailed it home to me today

 

[jmssaws]

It's definitely not the mtronic doing it alone, because the 066/064/390/395 will all do it if you go to far with the ignition advance. The odd part is, some will jerk the rope out of your hand but still not pop, and some start super smooth but still pop! I think it all has to do with dynamic compression, advance curve built in to the coil, and some other things I ain't figured out yet.

Ive never had a stihl pop from to much advance but I have some husky's.

It's not the ignition advance
It does it with no advance

 

[Time's Standing Stihl]

If we can agree that it's limited then what's it supposed to do when it hits thr limiter?

I'd like to know all the info on the 3 versions of the 4700 a,b,c, the 4701 and the euro coil. Be interesting to see the specs

 

[paragonbuilder]

Does it do it with the non mtronic carb?

 

[tree monkey]

If you port the cylinder far enough you eventually you have a cylinder that will outflow everything around it,bigger carb didn't seem to help but less muffler outlet fixed it.

The way the muffler is when you get a saw from me is the way it has to be,pull the screen and kill it.

My 066 that Shaun ported was that way,it is a beast but pull either screen and you will notice it loose power and pick up idle trouble.
I put a 1" wb on it with a 880 boot and it didn't run one bit different.
The cylinder is simply maxed out.
You have ran that saw dan.
You have ran the unicorn and it's no different.
Pull the screen on it and you will hurt it.

I never said maxed out.

really?