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My fs 90 stihl weedeater slowly lost power and then stoped and wont start

It seems to have low compression and it does have spark and fuel

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

hammmmmer33
  • 1 Answer

SOURCE: Stihl FS 85 stalls and wont start after about 20

hey, I have the same identical problem, I AM presently searching for a fuel cap, with totally no luck at all. If you know where one can get this fuel cap, please email me. hammmmmer33@yahoo.com Thanks in advance. Doug

Posted on Jun 18, 2009

canbruce75
  • 1776 Answers

SOURCE: starts then dies stihl fs45/weedeater

I sounds like it sucked up some debris in the bottom of the fuel tank and obstructed fuel flow somewhere. Start by blowing out the in-tank fuel filter (You will have to fish it out with something), then load the line with carb cleaner (wear safety glasses) put fuel filter back in line and crank it a few times to pull the carb cleaner into the carb. This may dislodge the obstruction. If this doesn't work, you will have to remove and cleant he carburator. Hope this helps.

Posted on Jul 05, 2009

lemmingleejn
  • 173 Answers

SOURCE: 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:)

Posted on Jul 25, 2009

Dolfoff
  • 148 Answers

SOURCE: stihl fs 45 ignition problem no spark

Disconnect the small spade terminal wires from the coil itself and test for spark. If you do not have spark replace coil. If you do have spark check those small wires for insulation damage and grounding. If wires are OK check kill switch.
NOTE: DO NOT START MACHINE with small wires unplugged! Only test for spark.

Posted on Sep 26, 2009

rwvanlue
  • 486 Answers

SOURCE: how do i set the carburetor on a Stihl FS-55

Over the past 8 years, the FS55 has had at least 5 different carburetors, and they have at least 3 different systems with different adjustments. Many of them do not have much of an adjustment and will not cure running problems. If you are experiencing poor running conditions, I would suggest some basic checks first. The spark arrestor screen is a big culprit on this model.

Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression

Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

Posted on Nov 23, 2009

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1 Answer

How do you adjust a Stihl weedeater carburetor?


Oiless fuel ruins your compression. The trimmer should crank anywhere above 50 psi. A good place to start with the jets is 3/4 to 1 out. You may have damaged the new jets by srewing them all the way in. These small jets are often needle thin and can be damaged when bottomed out.

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does it have spark, compression and fuel.? more info please

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Do you have compression, a good spark and is fuel going into the cylinder.? Working on a solution.

Jul 27, 2012 | Stihl Garden

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Stihl sf44 weedeater wont fire


more info please? does it now have a spark and good compression?

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How do i set the carburetor on a Stihl FS-55 weedeater.


Over the past 8 years, the FS55 has had at least 5 different carburetors, and they have at least 3 different systems with different adjustments. Many of them do not have much of an adjustment and will not cure running problems. If you are experiencing poor running conditions, I would suggest some basic checks first. The spark arrestor screen is a big culprit on this model.

Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression

Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

Nov 23, 2009 | Garden

2 Answers

My stihl fs 350 wont start at all any sugestions ?, thanks from mark uk


I would have a shop do a compression test on the engine. It should be at least 100 psi to run. And then a spark test on the ignition module to see if it firing to the spark plug. I would look at a carburetor rebuild. I would also mix up some fresh fuel mixture; anything over 30 days now is considered bad gas.

Sep 30, 2009 | Oregon Scientific Complete Carburetor for...

1 Answer

My stihl weedeater starts and idles fine but does not get power.


I have a Stihl FS 45 and have had problems with it running for a short time then cutting out. The problem is like to be either- the filter attached to end end of the fuel pick hose that goes down into the fuel tank is blocked or- there is a crack or split in the corrugated section of the fuel pick up hose between the fuel tank and the carburettor. If such a crack or split exists it will cause air to be sucked in with the fuel upsetting the fuel/air ratio. A new hose not adjustment is the only cure

Jul 07, 2009 | Worx 12" 4.5 Amp 2 In 1 Grass Trimmer/In...

2 Answers

Stihl FS 85 stalls and wont start after about 20


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Jim

Jun 10, 2009 | Garden

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.

Sep 17, 2008 | Garden

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