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Stihl FS 55 will not shut off

Will not shut off when button is pressed

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  • 322 Answers

I have seen the wire work itself or break off the ignition module and I have replaced several of the actual kill switches. Check the wires from the switch to the ignition module first and if they are good go to your local STIHL dealer and ask for the switch. The switch part number is 4229 430 0203

Posted on Jan 16, 2013

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

rwvanlue
  • 486 Answers

SOURCE: I am trying to rebuild my Stihl FS-55 weedeater.

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


1) Determine that there is spark?
2) Have you used a type of spark tester?
3) What is the condition of the plug. Brown or dark brown is OK. Black or silver is NOT Ok.
*If you do not have a spark tester,
a) remove the plug, and with it connected to the wire,
b) find a portion of metal around the cylinder that you can ground it on, and then pull the rope.
c) If the plug is black, you may see spark, but you should replace the plug.

*** PLEASE NOTE ; if there is excess fuel in the cylinder or on spark plug,
it can catch fire, so be carefull to cover the hole with a heavy rag so that any fuel
cannot be exposed to spark plug durning test !!!!
Get back with me on how this issue works out.
thanks, rwvanlue
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 22, 2009

mowerman1857
  • 389 Answers

SOURCE: Stihl FS 55 will not start

After trying to start several times, remove the spark plug and see if it is "wet" If it is you are flooding it. Do not pull the rope more than 3 or 4 times with the choke closed, whether it "pops" or not open the choke half way after the 4th pull and make sure you have the throttle trigger squeezed to give it gas

Posted on Sep 16, 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

  • 1 Answer

SOURCE: Replacing trimmer line with blade for stihl fs 90r trimmer

If you bought the trimmer new there should be a rod about 6" long and 1/8" thick. Above the trimmer head below the trimmer gearbox there is a hole. You have to put the rod in that hole and turn the head until that locks it from turning.

From there you can screw the trimmer head off by hand, or a strap wrench if it's really tight. It may be left hand threads.

Posted on May 24, 2010

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Stihl FS 55 will not start


After trying to start several times, remove the spark plug and see if it is "wet" If it is you are flooding it. Do not pull the rope more than 3 or 4 times with the choke closed, whether it "pops" or not open the choke half way after the 4th pull and make sure you have the throttle trigger squeezed to give it gas

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