Author Topic: Stihl MS390  (Read 2916 times)

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Offline Cut4fun

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Stihl MS390
« on: June 30, 2011, 04:02:10 pm »
Just got a stihl 390 and 025 in to work on. Both might be getting a 30 min caveman  muffler mod that sure beats the heck out of paying a $100 to a ebay seller.  :o

 I am going to test how they came in. Then after carb adjustments and tune if needed and then test again after muffler mod  on the ms390.  Going to see if a 025 would need any muffler opening or not.

The 390 the guy says is a PITA to start and by 3rd pull rips the handle out of his hand on kick back. :D  What is your take on that? I have ideas.

Oh and he said not to sharpen the chains that he does that himself. So when I get time next week I sure up it cuts to start off. Looks to have a 24" 25" stihl bar on it under the scabbard.

So what percentage do you think the 390 will gain in 1 cut time with same chain after muffler mod and carb adjustments?  Compared to just carb adjustment and no muffler mod.
 Not going to go by the way I will test when it just came in. Might run iffy who knows right now. 

If his chain wont cut for chit I will put my  chain on for testing.

I know what I got out of a MS290 with muffler mod and carb adjustments. I was really surprised by that one.
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Offline man of stihl

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Re: Stihl MS390
« Reply #1 on: June 30, 2011, 06:25:00 pm »
Does that 025 have the adjustable carb on it?
Ron

Offline John Mc

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Re: Stihl MS390
« Reply #2 on: June 30, 2011, 06:55:22 pm »
... 30 min caveman  muffler mod ...

Care to clue in a newbie on what that means?

Offline Cut4fun_

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Re: Stihl MS390
« Reply #3 on: June 30, 2011, 08:28:31 pm »
... 30 min caveman  muffler mod ...

Care to clue in a newbie on what that means?

A cheap no cost muffler modification that takes 30 minutes with a drill, dremel and  grinder. I only use all 3 because I have them on hand.  I call them caveman muffler mods.

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Offline Cut4fun_

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Re: Stihl MS390
« Reply #4 on: June 30, 2011, 08:29:36 pm »
Does that 025 have the adjustable carb on it?

On shelf till after July 4th. Will let you know later on.

What did your 025 project have for carb?
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Offline man of stihl

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Re: Stihl MS390
« Reply #5 on: June 30, 2011, 09:42:37 pm »
The non adjustable carb. I think it runs on the lean side now so i dont even want to take the spark screen out yet. That little bugger does impress me with the power it has. An adjustable carb will make it a keeper.  ;)
Ron

Offline Al Smith

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Re: Stihl MS390
« Reply #6 on: June 30, 2011, 09:48:13 pm »
The 039's really were not bad saws ,enough power .However it nor the 029 could hold up to professional use such as a tree service company  .Then again those boys aren't real gentle with them .Actualy they beat them to death truth be known .

I'd imagine though that a little work on the muffler would wake them up a tad .

Offline Cut4fun_

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Re: Stihl MS390
« Reply #7 on: July 01, 2011, 06:37:57 am »
The non adjustable carb. I think it runs on the lean side now so i dont even want to take the spark screen out yet. That little bugger does impress me with the power it has. An adjustable carb will make it a keeper.  ;)

I peeked at it this morning very quickly. The 025 has H and L on cover with 2 holes going back to  carb. Cant tell if one is blocked off or not.
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Offline bloodontheice

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Re: Stihl MS390
« Reply #8 on: July 01, 2011, 12:28:00 pm »
If it doesn't have one the fully adjustable carb is a WT215, about 35$ brand new.

Offline Cut4fun_

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Re: Stihl MS390
« Reply #9 on: July 01, 2011, 01:53:42 pm »
If it doesn't have one the fully adjustable carb is a WT215, about 35$ brand new.

MOS you see above and it seems to be on others too.


You can get a Walbro WT-215 carb from a 021/023/025 or MS210/250/230 and swap the throttle shaft and choke shaft from your carb into it and You'll have a fully adjustable Walbro carb. This setup is much better than the Zama junk on the 200t's IMO. The WT-215's can be had cheap if You watch ebay for 'em.

  8)
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Offline man of stihl

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Re: Stihl MS390
« Reply #10 on: July 01, 2011, 04:53:36 pm »
Yeah. i'll have to get me one of those.
Ron

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Re: Stihl MS390
« Reply #11 on: July 05, 2011, 06:21:28 pm »
The non adjustable carb. I think it runs on the lean side now so i dont even want to take the spark screen out yet. That little bugger does impress me with the power it has. An adjustable carb will make it a keeper.  ;)

I peeked at it this morning very quickly. The 025 has H and L on cover with 2 holes going back to  carb. Cant tell if one is blocked off or not.

MOS this 025 has a H and L carb. After looking at the muffler on it, all I could see doing was opening the 3 exhaust outlets up. Otherwise it looked fine and was already louder then the stock MS390 muffler  :D .  Re-tuned the L H and idle and she runs great.

The 390 picked up a 1000 rpm after muffler mod without adjusting carb.   Re-tuned L H idle  and she runs good for what it is.

Sorry it was just to dang hot for making video's of before and after.


Looks like this. White spots are added in.

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Offline Cut4fun

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Re: Stihl MS390
« Reply #12 on: July 14, 2011, 04:43:41 pm »
Just showing outer deflector opened up.

The muffler itself was opened up big time compared to stock 2 slits it used to breath out of.

Also when was the de-comp put on the 390?

This one didnt have one and was a complaint of the owner. The new d ring took care of that with a carb tune.



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Offline Al Smith

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Re: Stihl MS390
« Reply #13 on: July 15, 2011, 11:08:28 am »
 I can't recall ever seeing an actual 390, 039 yes .It didn't seem to have such excessive compression to even need a decomp .

I think though it seems that many manufactures are using decomps more so than was standard practice from previous years .

Offline man of stihl

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Re: Stihl MS390
« Reply #14 on: July 15, 2011, 02:44:14 pm »
I can't recall ever seeing an actual 390, 039 yes .It didn't seem to have such excessive compression to even need a decomp .

I think though it seems that many manufactures are using decomps more so than was standard practice from previous years .
My guess is they are using cheaper plastic starter parts. 
Ron

Offline Al Smith

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Re: Stihl MS390
« Reply #15 on: July 15, 2011, 06:14:10 pm »
 I don't know what they use on them .I've got some 029 and 039 parts in the shed though from dead ones .I'll peek when I get a chance .

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Re: Stihl MS390
« Reply #16 on: October 24, 2013, 02:50:36 am »




390 motor in a MS 290 case 25" b/c
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