Nik's Poulan Thread

[s sidewall]

Ok so this is what I found. Those look like thick rings to me. Also looks like an aluminum piston and bore. I could be wrong on the piston though. Picture of rings, piston, and model number included.View attachment 801359View attachment 801360 View attachment 801361

That is a 3800, has thick rings.

 

[Screwbolts]

This might help, this thread will answer your question. http://www.arboristsite.com/showthread.php?t=52197

 

[s sidewall]

If I was near my 3700, I would pull the muffler and snap a pic to post to show you the thin rings.

 

[Screwbolts]

Thick or thin rings are so self evident that just a glance should tell! Even for blind people. Thin are I believe 1.3mm/ .050 thick and thick are near .100.

One of the issues I see with the Black/grey Craftsman versions of the Poulan saws is craftsman did not put those handy decals on them that indecate. 3.4/3.7. They have the craftsman 358. someting model number on them, yes they do. But top covers do get changed and that cover may very well not have the correct number on it.

 

[Screwbolts]

What I didn't realize was that the 3800 had the same restrictive arch in the exhaust port as a 3400. Thank you for the information on that.

 

[Screwbolts]

Just measured the piston in my grey black saw, it is a 3800, 47mm piston. And it does have as Todd and many others have said the arch in the exhaust port. Thank you for helping me understand that 3400 and 3800 saws have the same arch in the exhaust port. The only difference is the bore diameter.

It will be arch less soon.

 

[s sidewall]

3700 and 4000 is square open

Steve Sidwell

 

[Todd Loosli]

Thin rings are..023 fold a business card in half and it's that thick, about.

 

[s sidewall]

This is a thick ring 3400, like the 3800.

Steve Sidwell

 

[RedneckChainsawRepair]

Pic that gets showed over and over for this.

 

[s sidewall]

The chrome on that 3800 piston looks good.

Steve Sidwell

 

[Oliver2150]

It definitely has thick rings. I’ll measure the bore tonight.

 

[s sidewall]

You can use a popsicle stick.

 

[Todd Loosli]

Bore diameter for
3400 1.812
3700 1.875
3800 1.880
4000 1.937

 

[Todd Loosli]

You can cut the popsicle stick like this and slide it in and tell if it fits

 

[Screwbolts]

3800 went from this ,



To this, rectangular, not square, with small radius on corners.

 

[fossil]

It definitely has thick rings. I’ll measure the bore tonight.

Just take a popsicle stick or plastic straw, push it to the center rear of the cylinder through the exhaust port and run the piston up against it so it marks the stick / straw and measure end to mark.

The straw will measure a little less that the stick due to the squared end.

I suppose a wood pencil would work as well.

I have a number of rebranded 3400's assembled in Canada that came with a 3800 top end on them.

There also a bunch of Poulan 3400's assembled in Caada with 3700 top ends on them. The giveaway besides the rings and starter pawls is the label on the recoil that reads 61cc.
The 3700 Craftsman saws used 3400 pawls and pulleys.

 

[Todd Loosli]

That should make the cylinder breathe much moe better. What did that take 15 minutes. Some of the best mods can be done in a short time and the benefits are huge. I say huge. Lol

 

[s sidewall]

Thought of doing that to my last acquired 3400 but decided to leave it alone.

Steve Sidwell

 

[Screwbolts]

Not over 15 minutes, lol, the saw is running strong now, I deleted the base gasket and had to make a new gasket to put between the isolator and jug. It was half gone when I took it apart and those two screws were not very snug.

I need to measure the bores of my yellow saws, they might have 3800 top ends, the one I did this treatment to recently runs about like my two 3700s.

Lunch time.