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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.

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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.

Posted on May 17, 2014

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Posted on Jan 02, 2017

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SOURCE: STIHL FS110R weedeater won't start, does not hit

my son flooded out my stihl weedeater, I took it had a new filter put in and it started right up. he went to use it again and now it wont start! It sat overnight and i still can start it! Any suggestions please

Posted on Jul 06, 2009

  • 5 Answers

SOURCE: how to replace coil on stihl fs85 weed trimmer

Remove the starter & cylinder cover and look for the coil mounted next to the flywheel. Remove the 2 screws holding it to the cylinder and cafefully pull the wires through the clips that hold them to the block. Install the new coil in the reverse order and set the air gap between the flywheel and the coil with a business card. Let the magnets on the flywheel pull the coil towards it with the business card in between. Tighten the screws and spin the flywheel to remove the card. Reassemble the stater and blower housing.

Posted on Sep 17, 2009

john224
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SOURCE: no manual, starting stihl fs 38 brushcutter

Here is the owner's manual.

Posted on Dec 17, 2009

  • 1 Answer

SOURCE: Stihl FS85 Weedeater

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

Posted on Jul 26, 2010

hunter19_46m
  • 7482 Answers

SOURCE: Edger won't run. replaced fuel, air filter and

Check your fuel filter in the fuel tank to make sure it is clean if it is then"
Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Keep in mind that the float for the carburetor must be level when you go to reassemble the carburetor or follow the instrucitons you get with the carburetor kit.
If the mower/weedeater is over a year old, then I also recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their orginal position before you started.
This is a FREE answer,Please rate me

Posted on Oct 12, 2010

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Why Do I Not Have Any Spark From The Ignition Module When Spark Plug is in The Cylinder


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If not clogged try adding a little fuel mix introduced into the carburetor throat. If starts then you have carb problems.

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

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Try replacing the spark plug and fuel filter to start with. Need to ensure you have fuel and spark. We have a list of things to check as techs but if it has spark fuel and compression it should run albeit poorly. If no spark check the ground circuit and if thats good replace the ignition module. If you have spark check the carburetor. It will most likely require a kit and cleaning

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My Stihl FS85 runs good for about 20 seconds and then shuts completely off. I have replaced the Plug, cleaned out the fuel system and it still does the same thing. Could it be the coil?


Sounds like the main jet or the diaphrams in the carburetor are deteriorated. Remove carb and soak in a good carburetor dip style cleaner and rebuild with a new kit. Also replace the fuel line and filter and use a fresh gas mix.

Sep 17, 2012 | Stihl FS 85 Weed Eater

1 Answer

Can not start my stihl Fs66 weedeater


Turn both screws CW to stops (lightly), then back out CCW 1-3/4 turns each. This a basic setting and both will need to be set leaner (CW) after the engine warms up. Remove the spark plug and check for blue sparks when the engine is pulled through. If nothing, try a new spark plug. If still nothing, try removing the stop switch connection at the ignition module and retry for sparks. If nothing again, replace the ignition module. Use a thin business card to set the pole gap (the magnets should be under the poles of the ignition module) when installing the replacement. If you get sparks in the first test, try spraying some carburetor cleaner in the plug hole, replace the plug, and attempt to start. If you get a pop or two, then you have fuel problems. Check the fuel lines for condition, check the filter inside the fuel tank for plugging, and tightness of the carburetor screws and nuts. Remove the muffler and check for plugging. Check the air cleaner for plugging. If it still won't run, then the carburetor should be removed, disassembled, cleaned, and fresh gaskets and diaphragms installed. Keep track of what went where as you remove parts. If the machine appears to have good compression, it should start. When the engine is warmed up, adjust the H needle to 4-stroke at high speed, but smooth out when cutting. The L needle should be adjusted to allow the engine to run fairly smoothly, but allow the engine to 'follow the throttle'. Idle speed should be set so that the string head does not turn, but keeps the engine running. Hope some of this will get you trimming again!

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Drain the fuel completely if it is older than 1 week. Make sure you undo the bolt at the bottom of the fuel bowl to ensure all old fuel is drained. Refill with fresh fuel (premium unleaded) and try again. If it still does not work then remove the spark plug and rest it on the metal of the mower while still attached to the silicone ignition wire. Have someone hold the cut out bar to the handle (as you normally would to run the motor) and pull the cord. You should see sparks being emitted from the spark plug. (Make sure there is no fuel nearby) If you cannot see any sparks then replace the spark plug with a new one and repeat this process. If you still cannot see any sparks being emitted after attatching the new plug to the silicone wire, resting it on the metal of the mower, and pulling the cord to start it as you normally would, the mower will need to have the resistor and capacitor checked by a professional repairer as no spark is being generated.

Good luck.

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3 Answers

Stihl FS85 Weedeater


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.

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