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Stihl FS85 Weedeater

Have to coax to get started, then it is jittery at that.  It shots out white smoke from exhaust.  Can not get it to start now. New spark plug, clean gas, suspect it is the coil, not sure. Where can I find a part list and order parts to fix myself.

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Stihl pro fs85 weedeater starts up shuts right off Will not stay running

Posted on Jul 26, 2010

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I suspect carb. trouble. Is the compression OK? Look at the spark plug after trying to start it. If it is wet, you are getting too much fuel. The white smoke indicates that. You may need to overhaul the carb.
Go on the Stihl site and customer service for information.

Posted on Feb 14, 2009

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Check to see if your exhaust port is clogged up, also check you spark arrester screen located on the muffler

Posted on Aug 20, 2010

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Hard to start..will not rev. up


STIHL TRIMMER-WEED EATER REPAIR: stihl carburetor ...

? 6:55
www.youtube.com/watch?v=vK6MsQalprY
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Aug 07, 2015 | Stihl FS 85 Weed Eater

1 Answer

My stihl weed eater fs85 hard to start when hot


Try loosening the gas cap to relieve any pressure, then tightening it back up. Usually you will just need to barely unscrew it and then screw it back even before you pull the rope.

Jul 13, 2014 | Stihl FS 85 Weed Eater

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I have just replaced the spark plug, fuel lines,brand new carby, and new ignition module, but will not start. any thoughts. It is a Stihl FS85 BRUSHCUTTER. Thanks.


I had the same model and always had a hard time getting it to start after taking it to shop it started three times ok then the hard to start all over again. It now is in the trash as I refuse to put any more money into it. Stihl makes a great chainsaw but I would never buy another trimmer or brushcutter from them again.

May 16, 2014 | Lawn Trimmers & Edgers

1 Answer

Stihl FS85 starts fine, But not take full throttle


Pumping the primer bubble while the engine is running should cause the engine to over fuel and stall (if the tuning is correct). Sounds like its not fueling enough, pumping the primer is forcing fuel through the carb causing the engine to pick up rev's, but this is soon exhausted which is why it wont rev on the throttle.
* Check that the fuel line is not damaged and drawing in air. (if this is intact try the next step)
* Strip and clean the carb. Replace any diaphrams if needed.
* Check gaskets seal between carb, air filter and cylinder.

Just out of curiosity what standard carb settings did you use.?

May 23, 2013 | Stihl FS 85 Weed Eater

1 Answer

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Im figuring the FS85 has the cow horn bars,of which there are 3 types of controls. Here's the Illustrated parts list diagram. If you would like the full IPL please contact me further and i will send it to you.

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Apr 17, 2013 | Stihl FS 85 Weed Eater

1 Answer

Stihl fs85 gives off white smoke while running


change to stihl ultra oil and make sure you ratios are correct. also replace spark plug and spark arrester.

Oct 07, 2012 | Stihl FS 85 Weed Eater

1 Answer

Wont start when hot


might be coil ? you can test it with and ohm meter should be within specs on both primary and secondary sides ? but try this first to see if its a vapor lock or fuel hose issue ? when it wont start get you a can of starting fluid and spray the air filter see if it restarts then ? this will tell you its fuel not spark ? then you can recheck hoses and primerbulb ? hope this helps

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1 Answer

No power fs66 stihl weedeater


Hi When you cleaned the muffler out did you also clean the carbon out of the port on the cylinder as this can be blocked as well. Also you will have to retune the carby, There should be 2 screws 1 for low speed marked l on the carby body and 1 marked h for high speed to start with they should be set at 1 & 1/2 turns out from closed the low speed you set at an idle and the high speed you set at full throttle. Hope this helps.

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1 Answer

Stihl weedeater starts but won't run at high speed


This sounds like a timing problem.
It is too far retarded, and needs advancing a couple of thou.
There you go:)

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3 Answers

Stihl FS85 Stalls when warm and gas is given will still idle


Make sure the carb settings are correct. Screw both tuning screws all the way in and then turn ot anticlockwise the following settings H 3/4 of a turn, L 1 full turn. (this is set to the standard setting)

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