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Stihl ms180c won't run at full throttle clean carb professionally 30 minutes later same problem Could it be something other than carburetor problem

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  • Master
  • 2,095 Answers

May be that the Gas tank vent is clogged. If you shut the saw off, crack the gas fill cap and start it again, will it run strong again?

Posted on May 02, 2017

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6ya6ya
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Posted on Jan 02, 2017

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  • 48 Answers

SOURCE: will only run with full choke and absolutely no throttle.

Carbs gummed up. Need a serious cleaning or a full ruubers replacement/rebuild kit. Gas turns to gummy when left stting in the fuel bowls.

Use a couple of cans of Sea Foam.. best stuff in the world.

Posted on Mar 20, 2009

  • 218 Answers

SOURCE: I have a stihl fs76 weed trimmer. It will start

Hi..my name is Keith...it sounds like the reeds in your carb needs replacing...usually if you use a carberator cleaner on them..it will ruin them..plus age will make them stiff..they should be as soft a rose petal..and its cheap and inexpensive to replace..but you have to pay attention to how many layers and the shape of the reeds that come out..because the kit that you buy will fix several different carbs..i hope this has helped..if not..write back

Posted on Jul 01, 2009

  • 85 Answers

SOURCE: Ryobi SS30 Carburetor Problems

Replace thecarb screen, make sure you can see through the screen

Posted on Aug 19, 2009

  • 389 Answers

SOURCE: Stihl MS290 only runs if the gas tank vent valve

sounds like you have a plugged vent either in the gas cap or the vent valve of which you speak. Without the vent working properly, the engine running and drawing gas from the fuel tank causes a vaccum inside the tank making it harder for the fuel to draw to the carburator. this would cause the symptoms that you are talking about.

Replace the gas cap if it is vented or check to see if the vent valve you mention is working properly.

Good Luck

Posted on Dec 21, 2009

2strokeJim
  • 577 Answers

SOURCE: stihl blower - full throttle it stalls out. low speed ok. have replaced fuel line, spark plug.

check your muffler screen for being plugged, this will cause it to not accelerate
2StrokeJim

Posted on Nov 19, 2011

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Why are the carburetors leaking gasoline?


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Stihl trimmer must use choke for full throttle


Sounds like a tuning issue and carb problem. Before you go spending money on carbs or carb kits and start stripping down the carb, try this first.
*Unscew both H and L tuning screws ( not all the way out but back them off)
*Pull over until the engine fires up, it should run for a second and cut out.
*Screw both the H & L all the way back in.
*Then reset the carb to standard settings.
*Unscrew the H tuning screw 3/4 of a full turn.
*Unscrew the L tuning screw 1 full turn.

This should be the standard settings.

Start saw as normal and see if its any better. Failing that your probably looking at cleaning the carb or replacing diaphrams.

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I just saw this deal on the Fs200 Stihl Brushcutter. Equipped with a Zama c1qs51 carb. Junk the carb. Go to a stihl dealer and buy a three screw chainsaw type carb with a high low and idle screw. The c1qs51 is junk.The three school carb will put an end to your worries. Of course change your fuel filter naturally. I guarantee this will fix the thing. I own an Fs200 and Fs250.

Jul 15, 2012 | Garden

1 Answer

The saw seems to be getting too much gas. with the filters off i can blow air in the carb and it does fine. i cleaned the needle valve and it does the same.


The carburetor could be set too rich for the unit to run properly. If you take it to a Stihl dealer they can tune the saw to the correct rpm. You can try to tune it to a "leaner" position. Look at the carburetor while it is on the unit and at Wide Open Throttle turn the H screw clockwise maybe half a turn and see if it will run at a higher rpm.
Alternatively you could re set the high side (Wide Open Throttle) by turning the screw until it seats (please turn the screw lightly as you could damage the seat) and turn it one full turn out. This is the factory setting and the unit should run O.K. at that position. If it still does not run correctly then there could be other issues with the carburetor that is making it not run very well.

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Stihl blower - full throttle it stalls out. low speed ok. have replaced fuel line, spark plug.


Your carburetor needs cleaned or you need a carb. kit depending on how old the carb. parts are. If you need tips on carb. cleaning, feel free to ask.

Jim

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