Stihl ms 190 runs wide open by it self

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

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

have idle control actuator checked

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)

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.

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!