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Have a FS 55 Stihl trimmer that quit working, rebuilt the carburetor, even bought a new one, have spark, 125 lbs compression, only backfires, simply will not run. Pressure checked the needle valve. I'm feel I'm looking at a crack, but where? When you have Fuel, Compression, Spark, should run like a top

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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panilling9
  • 284 Answers

SOURCE: Looking for printable copy of owner's manual for

go to www. stihlusa.com

click on product instruction manuals (under chainsaw picture)
click on download or order manuals
scroll down to trimmer section and find your fs80 and fs 85
click on it and it should come up and be what you were looking for

Posted on Jun 05, 2009

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SOURCE: pull cord is out and wont return. unable to crank stilh fs 45 we

Could be several things including a broken return spring. If you are not experienced with these springs please take it to a reputable shop to avoid any personal injury.

Posted on Jun 09, 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

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

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When i give my stihl weedeater (fs 55) gas it dies. i changed the gaskets in the carburetor, new spark plug, new air filter. it idles fine just when i give it throttle it dies


This could be from a bad fuel filter (has a dark appearance when dry), from the spark arrestor screen in the muffler being plugged up with carbon deposits (take out the spark arrestor screen and clean it by burning off the carbon deposits), or the carburetor needs to be adjusted. If the carburetor needs to be adjusted I would take it to the nearest Stihl dealer that has a Gold Certified Technician. That way the unit is adjusted properly and is in good running condition. You can find a local dealer with the dealer locator. The link is HERE.

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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.

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1 Answer

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

Sep 06, 2009 | Garden

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