Addi3800 is thick ring, 3700 is thin ring. Folks say 3700 is slightly stronger. Both are rated around 61cc
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As important, the 3700 has a chrome cylinder and aluminum piston whereas the 3800 is the opposite. Reason why you can't just swap pistons.3800 is thick ring, 3700 is thin ring. Folks say 3700 is slightly stronger. Both are rated around 61cc
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Couldn't have said it better myself.There seems to be a lot of questions about the Counter Vibe series of saws. To answer some of those questions. The Poulan 3400 was only two thick rings and had a unplated cylinder with a plated piston. This is the same for the Poulan 3800. The Poulan 3700 is two thin rings with a plated cylinder and they do run better than the 3800 because they have better compression. I know I have checked enough of them. There was a PP 375 also that is the same as a 3700. Then there is the Poulan 4000 which is the same as the PP 395 which is 65 cc and has two thin rings with a plated cylinder. I believe the PP 395 all came with chain brakes. The biggest differences in the saws are the recoil systems that they use and the air filter and cover that they use. I do not remember if all the clutches were the same or not. Maybe someone else can chime in on that. I think some of the mufflers might have been different also.
The Red Sears Craftsman saws you see that were marked 3.7 could have been a 3800 or a 3700. I have both in Red. I believe the Grey ones were all 3800's.
You can take a piston and cylinder from a 4000 and it will fit on a 3400. The squish on the saws are usually around .040" to .045" so you can eliminate the base gasket and take .015" from the base to bump up the compression and bring the squish down to around .020" to .025".
You can also take a burr and a dremel and clean up the plastic intake on these saws. The intakes have some places from where they were cast that can stand to be smoothed out.
You can also advance the timing by turning the flywheel CCW. Just thin the key some or make another key from a nickel.
Then Muffler Mod it.
All the CounterVibes all used the same oilers and the plastic intakes are all the same.
Yup. You can dremel out the interior to make a smoother fuel flow. There is kind of an angle in there.Plastic intake: Is that the part the carb bolts to or the part that is below the air filter?
Plastic intake: Is that the part the carb bolts to or the part that is below the air filter?
Yup. You can dremel out the interior to make a smoother fuel flow. There is kind of an angle in there.
What part am I dremeling? It is circular like the venturi, then it angles and widens out. Just having glanced at it, I would think you would dremel it so that where it widens on the one side would be more inline with the venturi. Too much and you would get in the pocket for the carb bolt. But what do I know?
Herr is a picture: http://assets.partstree.com/web4/photos/580/530024229/566faf88686c5/full.png
thats mine and my buddy's saw, he has a 3.4 thin ring, not powersharp
-Efisher26-
Does anyone know if the 3400 was ever available in thin ring setup? ive never seen but thick ones
No such thing as a thin ring 3400/3.4. They are all bare bore thick ring.
Can anyone share the stihl number for the nice big pull cord handles that someone listed here a while back? I believe @Jeremiah Johnson posted it. I think @Boomer87 was in on that one too. I wrote the number down at the time but lost my paper. I was gonna order some for my 910 and 920 jonsereds.
I used the rescue handles as well, my dealer was 5.94 a piece and they are totally worth it.Can anyone share the stihl number for the nice big pull cord handles that someone listed here a while back? I believe @Jeremiah Johnson posted it. I think @Boomer87 was in on that one too. I wrote the number down at the time but lost my paper. I was gonna order some for my 910 and 920 jonsereds.