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Stihl ms 190 runs wide open by it self

Throttle linkage good. Intake boot good.Impulse hose good. Tried two new carbs. Same thing the saw will blow up if I don't kill engine

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  • Stihl Master
  • 1,098 Answers

Sounds like you are missing a return spring for the throttle. or broken

Posted on Aug 25, 2019

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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Savu Mihai

  • 211 Answers

SOURCE: Stihl MS 260 Pro wont run wide open or idle.

Hi brandon First change the sparkplug with the same heat range,Check and clean the gas filter with compressed air.Remove the carb and very carefully disassembly entirely.Check the gaskets and the diafragms.At the fuel pump side there is a fine screen(clean it).Check the needle,the spring and lever.Unlock the screws L and H(note how many turns are they).Put the corp of the carb in a special clean solution for 12 hours and then clean it with compressed air(something is clogged there).Put all back together and try to start the engine. regards savumihai71

Posted on Feb 12, 2009

michael wiggins

  • 135 Answers

SOURCE: Engine cranks and runs but runs like throttle is wide open??

have idle control actuator checked

Posted on May 12, 2009

Anonymous

  • 246 Answers

SOURCE: tecumseh engine #143.985510 - carb linkage hook-up

Hello:

The Carbuertor Throttle is Held in the Full Open Position Until the Engine is Started and Running, then the Governor and Spring Work together to Keep the Engine RPMs to the Desired Setting.
The Following is an Explaination on How the Governor System on Small Engines Function.
>>The Governor System behaves like an Unending Tug of War between One of Two Governor Springs, which Pull the Throttle Toward the Open Position, and a Spinning Crankshaft, which Tries to Close the Throttle. When the Load on the Engine Increases - a Typical Example is when you Move your Running Lawn Mower from the Driveway to the Grass - Crankshaft Revolutions Drop. But the Governor Spring is Still Tugging, Causing the Throttle Plate to Open. In Response, a Larger Volume of Air-Fuel Mixture Enters the Carburetor, Increasing Engine Speed to Compensate for the Increased Load. The Crankshaft Speeds Up, and the Tug of War Resumes, until a New Equilibrium is Achieved. With Each Change in Load, the Tension Between the Governor Spring and the Load Brings about a New Equilibrium, known as the Engine's Governed Speed. Neither Side Wins until the Engine is Shut Off. At that Point, without the Crankshaft Spinning, the Governor Spring Pulls the Throttle to the Wide-Open Position. Two Types of Governors are Common on Small Engines - Mechanical and Pneumatic.
Please, Do Not Hesitate, If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck

Respectfully

jbridger (John)

Posted on May 13, 2009

Tom W

  • 760 Answers

SOURCE: 24horse vtwin runs good at

Sounds like you're getting enough fuel (black smoke) Could be running on only one cylinder. Either stuck valve or loose valve adjustment or one bad magneto. You could try starting with one spark plug disconnected. If it doesn't start, reconnect that one and disconnect the other. IF it runs like it was, then you're running only one cylinder, and go to work on finding out why.

Posted on Aug 05, 2010

drallim

  • 4088 Answers

SOURCE: my stihl chain saw will not run. it would run for

Check the fuel filter, air cleaner and muffler for plugging. Check the fuel lines for decay or other damage. Check the carburetor mounting to the engine for looseness or any decay of the gaskets or any rubber parts. Make sure the chain is being oiled properly and is adjusted well. Hope this helps!

Posted on Nov 21, 2010

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1 Answer

Stihl 180c runs wide open all the time.it has a new carb on it, linkage is fine


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My 025 stihl chain saw runs erratic from wide open to stop, no idle


I have found that replacing the carb. with a new one . Usually between 27.00 to 38.00 dollars usually saves a lot of time over installing a kit. problem is usually due to a jet problem or the ethanol in the gas has removed the coating on a plug inside the carb. which requires carb. replacement

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Hit the throttle it quits running . it starts right up fast idle ok cuts good .wide open throttle runs fine. let it idle and hit the throttle it dies, starts right back up. has new carb kit, fuel, spark...


Conected to the rubber induction boot is the impulse hose, it is a short curled pipe, make sure this has not split and is conected to the two nipples on the carb flange.

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I replaced fuel line from carb to intake and now it wont start?


Check the carb fuel stub to see if its seated in the hose. Chech to see if you re-installed the piston underside scavenge hose to the bottom stub of the carb. Check your compression. New is 160 psi, operational but problematic (hard start) 130~140 and completely toast at 90. This saw is easy to flood when compression has fallen off. Cold start, 3 pulls choke on with the throttle trigger locked wide open. At first sputter, put choke in normal run and it should fire by the 3rd pull. If not its flooded. Then remove the plug and with an air hose vacate the cylinder of fuel for a few minutes and try again without the choke or throttle lock set at wide open.

Good luck.

Nov 27, 2010 | Makita DPC7311 73cc 14Inch Gas Powered...

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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1 Answer

Sthil ms 192t revs than drops off @wot


Check the gaskets and heat insulator between the cylinder and carburetor base for any leaks or plugging of the impulse pumper air passage. Make sure that a gasket has not been placed in such a way that it blocks this passage. Also, if there is an anti-vibration coupling, it may have cracked the rubber causing an air leak. The engine appears to be running only on primed fuel, but not pumping anything new. Hope this helps!

May 22, 2010 | Garden

1 Answer

Stihl model f545 will start but will not throttle up


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

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

Nov 24, 2009 | Husqvarna Garden

1 Answer

When i open the throttle a little, the speed increases but at full throttle, the power drops and I lose speed. Admittedly, I bought the C/Saw from a market 'as seen' and I found a few problems like broken...


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

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

Nov 24, 2009 | Heavy Machinery

1 Answer

Bp30185 wont full run wide open


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

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

Nov 22, 2009 | Homelite Garden

1 Answer

Hi, I have a Stihl 192 MS, a climbing saw. I don't use it alot lately and its bogging down when I try to rev it up. It starts fine and runs on its own but when I try to give it gas it dies out. In order...


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

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

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