Author Topic: Stihl 084  (Read 7592 times)

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Offline Cut4fun .

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Re: Stihl 084 AV dies at idle
« Reply #20 on: October 28, 2011, 05:30:54 pm »
Tillotson HT IPL below with parts list and parts breakdown

http://www.tillotson.ie/docs/HTPartsList.pdf
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Offline man of stihl

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Re: Stihl 084 AV dies at idle
« Reply #21 on: October 28, 2011, 06:04:40 pm »
The service manual says; adjustable carb L=1 turn, H=1 turn. Fixed jet carb L=1.25 turns, H= 0 turns. So if you have an adjustable H carb. it needs to be 1 turn out.
Ron

Offline Al Smith

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Re: Stihl 084 AV dies at idle
« Reply #22 on: October 28, 2011, 07:13:00 pm »
I think there appears to be a slight communication gap here .No saw I know of would idle with the low speed jet set at zero  or tight against the seat .Now you can get them to run with the high speed completely blocked but they don't run real good .

Fact being on that one of my 200T's is doing exactly that but that's another story .

Offline mike84c

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Re: Stihl 084 AV dies at idle
« Reply #23 on: October 28, 2011, 10:46:56 pm »
It is a HT2, and the needles are not limited, you can screw them all the way in, and all the way out.  I will try to open the high out 1 turn, but I'm guessing that if the saw is marked with a stamp saying to have the high at 0 turns out, it may be a fixed jet carb.  not sure how I would tell the difference though.  I have my doubts that adjusting the high speed needle would do much good, since it is only having a problem at idle.  Is there any small idle passages that I may be overlooking, that could be clogged.  I went thru the carb pretty well just now, and other than removing the welch plug (I dont have a spare), it looks clean.

Offline Cut4fun .

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Re: Stihl 084 AV dies at idle
« Reply #24 on: October 29, 2011, 12:04:23 am »
Have you removed the H and L needles and sprayed carb cleaner through to see it coming out in the carb with covers off? To know the flow is making it through.
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Offline mike84c

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Re: Stihl 084 AV dies at idle
« Reply #25 on: October 29, 2011, 06:40:55 am »
yes I have, but I cant tell if its coming out of one or more than one passage in the carb, and I believe it has to be more than one passage, an inlet to the needle, and an outlet to the air stream.

Offline Al Smith

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Re: Stihl 084 AV dies at idle
« Reply #26 on: October 29, 2011, 08:13:18 am »
It's nearly impossible to trouble shoot over the internet so the best most of us can do is give what advice we might think to be the problem .

In very occasions in spite of perhaps rebuilding the carb with new internal parts they still won't preform correctly .In some of those rare occasion some of the internal passage ways have somehow became resticted with a tiny bit of some foreign material .

Some times just a little shot of compressed air will clean them out but on rare occasions they need "rodded " in essence using a fine wire or something shoved through the passages  to clear the obstruction .

I use a set of torch cleaning wires which cost less than 10 dollars for the long ones .Fact I had to do exactly that proceedure on a Briggs and Straton carb about a week ago after I had the damned thing off the mower for the third time .I was getting a tad bit annoyed with that thing to say the least .The cure worked .

Offline Cut4fun .

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Re: Stihl 084 AV dies at idle
« Reply #27 on: October 29, 2011, 11:05:17 am »
Do you have a way to put a known good HT carb on in place of yours? 30min swap to test. 

Have you put in a new complete HT carb kit and rebuilt yours?

Get one of those harbor freight heated ultrasonic cleaners and you would be amazed at the crap that still comes out of a carb even after you rebuild it. To me this is a last resort option even after failed rebuild.
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Offline mike84c

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Re: Stihl 084 AV dies at idle
« Reply #28 on: October 29, 2011, 12:14:38 pm »
thanks guys, I will try to "rod' the passages, I do have a torch tip cleaner, several probably, with a lot of bent wires.  I am waiting for a new welch plug, so I can pull the plug from the carb, and I will try your suggestions.  I will report back when I get the welch plug off, cleaned, and back together.
If that doesn't work, anyone got a HT for sale for not too much?
mike

Offline Cut4fun

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Re: Stihl 084 AV dies at idle
« Reply #29 on: October 29, 2011, 12:38:07 pm »
I think I traded or sold all my HT carbs. I will check.

Good used rebuildable HT goes for $40 $50, already rebuilt with new kits were bring $60 $75 watch out though some were rev limited with gov built into them. Some 3 and 5 models I think.

I might have some left over HT carb kit pieces. I will check and if I do I will stick a welch plug in a envelope and mail if you like.

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