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Author Topic: MS 390 will not idle  (Read 923 times)

0 Members and 2 Guests are viewing this topic.

Offline Ward Barnes

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  • Posts: 62
  • Age: 62
  • Location: Wake, VA
  • Gender: Male
  • Married 26 years.
Re: MS 390 will not idle
« Reply #20 on: February 07, 2012, 12:00:26 pm »
Howdy Folks:

I finally got Davie (my friend who knows what he is doing) to tell me what he did to get the saw running.  He just grinned and told me I had installed the diaphragm in backwards.

There is an old saying that if something can be installed backwards, someone will do it.  I did.

And just think.  I used to repair airplanes for a living.

God Bless, Ward and Mary.
5 year old Stihl MS 390.  Kubota BX 2200 tractor. 
Dull chains cause accidents.  Accidents cause shorter life spans.
You don't sharpen a chain when it gets dull.  You sharpen a chain to keep it from getting dull.

Offline joe_indi

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  • Posts: 416
  • Age: 57
  • Location: India
  • Gender: Male
  • The older I get the more I learn
Re: MS 390 will not idle
« Reply #21 on: February 12, 2012, 01:25:33 pm »
You were lucky Ward,
With the diaphragm backward in a saw you wouldn't cut wood.  But if it were a plane you would drop out of the sky.

Joe

Offline propster

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  • Posts: 26
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Re: MS 390 will not idle
« Reply #22 on: February 12, 2012, 11:22:38 pm »
Joe, if you can mull over another one, I am having the nearly identical problem with my 55 Rancher as Ward. Symptoms are like #1 - starts after one pull on choke, fires up on high right away, but after letting up on the throttle she won't idle.  Plug dry, I have the limiters on my adjusters, and have tried every conceivable position and combination. Anyone know if my saw has the impulse hose? It doesn't look familiar and I just had everything out of there and cleaned it out completely. New muffler screen, new air filter, new fuel filter. The only thing I didn't replace that I wanted to was the fuel line, but the hose they sent me is shorter than what's on there now so I didn't try. I would say the only thing my saw did different than Ward's is that when it first starts it goes right to running high and I have to bump the throttle to get it to idle down, and then it quits. Do I have something sticking there in the throttle linkage as well possibly? And I second Ward's praise of everyone here, you've all been so helpful and I appreciate it and am learning lots.

 


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