Author Topic: Stihl MS390  (Read 4189 times)

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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

Offline Cut4fun .

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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 .

Offline H 2 H

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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
"People ask me where all my money went, I tell them half of it I spent on gambling, fast women and liquor, the other half I wasted!" W.C.

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Offline Cut4fun .

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Re: Stihl MS390
« Reply #17 on: December 14, 2015, 04:02:37 pm »
Parts came in for the 390 that came in Thurs.  Time to earn some $$ from the stihls that keep coming in  8) ;D.
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Offline Cut4fun .

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Re: Stihl MS390
« Reply #18 on: December 14, 2015, 05:12:58 pm »
So do all these aftermarket fuel lines have a thin spot in them and kink right behind the carb?  I was chasing why after installing new fuel line as to why this saw wasnt getting fuel.  Turned out the above.

So I tried to to trim the end part of afm fuel line to shorten it to stop the kinking but it is just to weak in that spot and still kinks.

Guess it will be OEM line or my Redneck stihl fuel line method if this is how all the aftermarket stihl fuel lines are. 
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Offline Cut4fun .

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Re: Stihl MS390
« Reply #19 on: December 14, 2015, 05:58:23 pm »
That was it.

Ran my Stihl Redneck fuel line bypass it works like a charm.


Redneck fuel line repair 1  ;D .   aftermarket stihl fuel line 0   >:(


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