MS390 / 039 pop up piston

[Terry Syd]

I don’t want to replace a piston in a clamshell anymore than I have to.

I don't dislike working on this saw, I hate it. What were the Germans thinking when they designed this POS?

Thankfully, I'm rebuilding a mower at the moment so I've got some time to store up some gumption to tear into the 029.

 

[Lightning Performance]

Step away from the bench, deep breaths.

I have some farm saws coming. They are going to be good mix with what I already have.

The first thing to know is the early saws, excluding 029 45mm, never had one, the port timing is different. 0 vs MS are different to. 310 has bigger runners than an 039 or ms390. 029S has the shortest blowdown.

 

[Adirondackstihl]

1127’s are simple to work on.
Send to me and I’ll send you a 441 to work on

 

[Fruecrue]

1127’s are simple to work on.
Send to me and I’ll send you a 441 to work on

Fixeded.

 

[Frank bierce]

May I say that I’m quite impressed!!!! Lol

 

[Dub11]

I don't dislike working on this saw, I hate it. What were the Germans thinking when they designed this POS?

Thankfully, I'm rebuilding a mower at the moment so I've got some time to store up some gumption to tear into the 029.

They were thinking "God I hope there isn't a husky dealer around"

 

[Fruecrue]

May I say that I’m quite impressed!!!! Lol

Frank, that video was before the pop up.
Saw does however have other mods.

 

[Fruecrue]

After;

 

[Frank bierce]

Saw both videos. Was quite impressed on near stock
Form with a 36” bar! Wold have never guessed it would pull that well.

 

[RI Chevy]

Some nice gains made! Nice job. [emoji106]

 

[94BULLITT]

1127’s are simple to work on.

I don't mind working on them either. I had the cylinder off mine in under 20 minutes. I could have had it off a little a quicker but I tried taking a shortcut on get the wiring unhooked. Once you get the rear handle off and the wrap handle it is like working on a pro grade saw.

 

[Frank bierce]

I don't mind working on them either. I had the cylinder off mine in under 20 minutes. I could have had it off a little a quicker but I tried taking a shortcut on get the wiring unhooked. Once you get the rear handle off and the wrap handle it is like working on a pro grade saw.

Sooooo, what you’re saying is...take everything off around the cylinder, and it is easy to get to? Well, that’s a relief!!

 

[94BULLITT]

Sooooo, what you’re saying is...take everything off around the cylinder, and it is easy to get to? Well, that’s a relief!!

Pop a few plugs out, then maybe 8 screws (all impact stuff) and wrap handle and rear handle are off.

Sent from my SM-G950U using Tapatalk

 

[Terry Syd]

The worse part for me is getting the wiring and impulse line back through the plastic divider. Sometimes it has been not to bad - and then there are the other times..

 

[94BULLITT]

The worse part for me is getting the wiring and impulse line back through the plastic divider. Sometimes it has been not to bad - and then there are the other times..

I hate the wiring.

 

[94BULLITT]

@Fruecrue How much did you advance the timing? I tried it in the past and tired it on this saw I'm working on now. Both times it did nothing. I went 1/3 of the key this time.

 

[D B Cooper]

Got my sleeper 290 with the cross 390 cylinder and pop up piston back together.
Filed about a 1/4 of the keyway,added 2 starter pawls to the rewind.
Next is the muffler mod. Hopefully get it fired up and a quick tune soon.

 

[blsnelling]

Is the goal here to see what this custom piston can do for a 039/390 or to see how strong you can build said saw? My point is that if you don't work from a known baseline, you have no idea what the piston actually did.

 

[Fruecrue]

This one is advanced 1/2 key.

@Fruecrue How much did you advance the timing? I tried it in the past and tired it on this saw I'm working on now. Both times it did nothing. I went 1/3 of the key this time.

 

[Czed]

@Czed
What aftermarket 044 carb did you use on the 029 you fixed a few weeks back?

Just a 12.00 huztl
It really woke the 290 up
He's going to run it until it needs a rebuild
Then i will put a 390 with popup in.