Complete Carburetor for Stihl 4122 Brush Cutter and 4226HS…

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Had the same problem.in the fuel tank is a gas filter and a fuel line. replace both.the line gets soft with age and collapse and restricts fuel flow.while u are at it replace the other two fuel lines as well. easy to get to when u have the cover off.

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If your trimmer engine idles, but stalls on throttle, check the following parts: the gasket, primer bulb, fuel filter, air filter, fuel vent, fuel line, and carburetor. The repair and symptom guide will help you better identify the part needed to be replaced and how.
A clogged carburetor is most commonly caused by leaving fuel in the string trimmer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.
My Petrol Strimmer/Brush Cutter will not idle Print

Fuel: Make sure it is fresh and correctly mixed (see `Starting Issues`). Air filter: Make sure it is clean and unclogged. Fuel cap: Make sure it`s hand-tight (not too tight or too loose). Carburettor: see below.

Just Like Spark plug fouling, too much oil in the gasoline, inferior oil, a dirty air filter and/or continued operation at less than full throttle will plug the screen with carbon deposits. This prevents exhaust gases from flowing out, which leads to power loss or not running at all.
When your trimmer starts and runs on choke, it could be because the check valve in the gas cap is clogged. Start the trimmer and gently unscrew the gas cap halfway off. Turn the choke off and assess. If the engine is still running, that means the gas cap may be the culprit.
The fuel line may be clogged from stale fuel deposits, more reasons to cause your chainsaw to cut out when applying throttle. If a fuel line is cracked, it will leak gasoline and draw air from outside into the fuel line. If the line is leaking fuel, it needs to be replaced.
The carburetor might be clogged. A clogged carburetor is often caused by leaving fuel in the chainsaw for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the chainsaw engine to stall.
The clutch engages the clutch pads to spin the trimmer head. If the clutch assembly is defective, the clutch will not disengage the clutch pads, and the trimmer head will continue to spin, even at low speeds. If the clutch is defective, replace it. (Note: some string trimmers do not have a clutch.
Here are two of the most common questions we get asked from skid steer owners looking for their first brush cutter: Do I need high-flow hydraulics on my skid steer to run a brush cutter? The answer is no, you do not.
This can be due to corrosion, scratches or general wear. As a result, the cutting edges of the cutter comb of your blades are no longer sharp, reducing their ability to cut. Sharpening the blade is required to reface the cutting surfaces restore these sharp edges.
Charge only when needed and never overcharge The Trimmer.
Why would the engine only run while the choke is on or with repeated manual priming? An engine that requires the choking (partial or full) after initial engine warm up is an indication that the engine fuel air mixture system is out of adjustment.
The carburetor gasket prevents excess air from entering the engine. If this gasket is damaged, it can result in an engine that only runs with the choke on.
If the engine is not revving up and cuts out before you reach higher revs then you need to do the following checks: Fuel: Make sure it is fresh and correctly mixed (see `Starting Issues`). Air filter: Make sure it is clean and unclogged. Fuel cap: Make sure it`s hand-tight.
If the engine is running fast (revving high):

Make sure that the choke is disengaged and the throttle hold has been reset by pressing the trigger. You can check the throttle cable to make sure there are no kinks found in it – however this requires a mechanical proficiency to strip down the machine uncovering the cable.

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Once my Stihl MS310 saw warms up, it stops running when I release the throttle trigger. Sometimes I can “catch” it by gunning the throttle, but usually I fail to catch the stall fast enough and it quits. The dealer hasn’t been able to correct this.
ANSWER : I would richen the low speed jet and set the idle a little faster without having the clutch engage. just a few ideas

Stihl FS40 Runs for 60 secs at low RPM with the trigger fully depressed – then quits
ANSWER : Had the same problem.in the fuel tank is a gas filter and a fuel line. replace both.the line gets soft with age and collapse and restricts fuel flow.while u are at it replace the other two fuel lines as well. easy to get to when u have the cover off.

When motor is running I have no chain drive when trigger is pressed.
ANSWER : Check and see if clutch is working or chain is adjusted too tight.

Want run unless choke remains on – Stihl Bg72 Leaf Blower Intake
ANSWER : Probably fuel starvation.Wrong fuel air mix settings on the carb. Damaged carb diaphragm.

Trigger for stihl weedeater
ANSWER : Stihl dealer…. stihlusa.com dealer search..

Need parts list for Stihl FS 75 trimmer – Oregon Scientific Complete Carburetor for Stihl 4122 Brush Cutter and 4226HS Hedge Trimmer
ANSWER : Look at your local lawn and garden place some times they have extra parts that you can use for your trimmer. Or call the company them selfs and ask them if they have parts.

I HAVE AN O17 STIHL CHAIN SAW AND IT LEAKS CHAIN OIL
EVEN WHEN IT IS NOT BEING USED
ANSWER : That can happen. When you go to store it, open the oil cap and then close it to lose the pressure the pump builds up inside.

Saw has new vent wont run after hot unless i loosen cap
ANSWER : The vent is not working properly or was installed incorrectly, so there is no negative air entering the tank to take up the space of the fuel leaving it for the combustion chamber. Perhaps your tank cap has a vent as well that isn’t working.