Author Topic: Stihl 084  (Read 7592 times)

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Offline mike84c

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Stihl 084
« Reply #10 on: October 28, 2011, 11:11:22 am »
My Stihl 084AV dies at idle, and I was wondering if anyone had an idea.  It starts fine, runs out fine, actually seems a bit rich at top rpm while cutting, but can't adjust the high speed needle closed more than the "0" turns reccomended.  Once it drops down to idle, it will idle a few seconds, then leans out and dies.  If I catch it while it is leaning out, I can get it revved up again, and keep it going, but as soon as I let it drop down to idle, I've got about 4 seconds till it dies.  The low speed jet does not seem to help any, as I've opened it way up, and it still does the same thing.  I've pulled the carb, and **** it open, Tillotson HT I think, and it looked clean, nothing noticable.  Any suggestions would be appreciated, and if you have a good source for parts, I'd appreciate that.
Mike

Offline Al Smith

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Re: Stihl 084 AV dies at idle
« Reply #11 on: October 28, 2011, 12:31:08 pm »
Probabley the butterfly is closed all the way .You have an idle adjustment screw which sets the amount open of the butterfly at idle .The jets control the fuel and the butterfly adjusts the air .

The butterfly has to be open just a tiny bit else it can't get fuel to the engine .

Offline mike84c

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Re: Stihl 084 AV dies at idle
« Reply #12 on: October 28, 2011, 01:28:04 pm »
Thanks for the reply, I'll try that and let you know
Mike

Offline Cut4fun .

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Re: Stihl 084 AV dies at idle
« Reply #13 on: October 28, 2011, 02:04:45 pm »
Do as Al says to set idle.

 I would also I like to know where you have your L set and H set at? 1 turn give or take each out, 1.5 1.25  2 turns etc See what I am asking.  ;)

I have a 084 IPL, no pdf service manual that I can remember out there. I had a hard copy and sent it to another member here if we needed help.
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Offline Cut4fun

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Re: Stihl 084 AV dies at idle
« Reply #14 on: October 28, 2011, 02:27:12 pm »
On the 084 parts. Just post in wanted or this thread what you are needing. I used to have tons of 084 stuff put sold all the parts when I sold the 4 084's.
cut4fun and chainsawrepair is same person PM if you like also. I can pretty much find something if it is out there for sale.  ;)







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Offline Cut4fun

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Re: Stihl 084 AV dies at idle
« Reply #15 on: October 28, 2011, 02:35:04 pm »
Some of the 084 parts I got rid of and know where there are in about 3 directions.
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Offline mike84c

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Re: Stihl 084 AV dies at idle
« Reply #16 on: October 28, 2011, 03:26:12 pm »
I tried opening up the throttle, but even at its stop, it still dies.  I have the high set at "0" open, and the low at about 1.5 turn open.  The carb cover says 1.25 open for low, and 0 open for high, althogh I have never come across a 0 recommended opening before.  any ideas?
thanks
Mike

Offline Cut4fun .

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Re: Stihl 084 AV dies at idle
« Reply #17 on: October 28, 2011, 05:04:39 pm »
0 on H dont makes no sense  ???.   What HT carb do you have? HT-1 2 3 5 7  type numbers   

Have you rebuilt the carb? recently? Started problem after that?

WAG whats the tank vent looking like? Blocked up, missing brass screws, just fishing for stuff.

WAG I cant remember which side it was but the 084 was bad about wallowing out a case half around the crank bearing creating air leak. Is your crank bearings and everything tight with no up down movement when prying up on flywheel or clutch side end?
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Offline mike84c

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Re: Stihl 084 AV dies at idle
« Reply #18 on: October 28, 2011, 05:22:20 pm »
I agree about the 0 turns out, but that is what it is marked on the side of the plastic filter cover.  I bought this saw a couple of years ago, and it was at 0 turns out when I bought it, and ran ok.  I will check the crank bearing, hope thats not it, but I'll check.  it is a -2 carb.  I haven't checked the tank vent, not sure where it is to be honest.

Offline Cut4fun .

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Re: Stihl 084 AV dies at idle
« Reply #19 on: October 28, 2011, 05:25:55 pm »
I've seen one stihl with 0 on a cover before and it had carb stops on it. Does this 084 have rev limiters on the carb screws? Plastic tabs? I've never had these on any of my 084's.

If so you cant get full travel of carb needle adjustments.  You need to trim tabs or remove them and turn screws to a lightly seat position and do carb settings right way without tabs on.

Like I said never seen them on a HT carb.
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