If the engine stalls while idling, turn the idle speed screw clockwise until the cutting blades on the Stihl HS-80 start to move. With a flat screwdriver, rotate the low speed screw clockwise until it fully seats. ![]() How to Adjust a Stihl HS-80’s Carburetor Start the engine and let it warm up for five minutes. ![]() What size string does a Stihl FS 90 use? On a Stihl hedge trimmer, how do you adjust the carburetor?.How do you change the string on a Stihl FS 55?.How do you start a Stihl FS 55 Weedeater?.It regulates the fuel/air mixture passing through the motor at low rpms.” That’s the “low” side adjustment, as the “L” means. During high rpms, it regulates the fuel/air mixture that passes into the motor. The “h” on every saw indicates that it is the “high” side adjustment. A clogged fuel filter is frequently caused by the chainsaw’s old fuel. It’s possible that the fuel filter is clogged. Try cleaning the carburetor with a carburetor cleaner if it’s clogged. Why does my chainsaw begin and then stop? This sticky fuel can clog the carburetor, causing the chainsaw engine to stall. Turn the “Lo” screw counterclockwise until the engine idle smooths out. To position the needle end of the screws into the carburetor’s “jets,” tighten the screws with a small Phillips screwdriver. ![]() How to Adjust a Weed Eater’s Carburetor Locate the two fuel adjustment screws on the carburetor’s side. Also, what is the procedure for adjusting a Weedeater carburetor? Adjust the high-speed (H) screw if the saw is stalling or doesn’t reach full power when you pull the throttle trigger. To do so, use a flat-head screwdriver to turn the “L” screw clockwise and counterclockwise.Īlso, when I give my chainsaw gas, why does it stall? When the carburetor gets too much or not enough fuel, an engine stalls. Before adjusting the high- and low-speed screws, determine the carburetor type. They’re the high-speed, low-speed, and idle adjustments, respectively. Similarly, on a Stihl chainsaw, how do you adjust the carburetor? To rev the engine, press the machine’s trigger. Allow the engine to warm up before starting it. To open the ‘L’ screw, tighten it all the way and turn it one turn counterclockwise. See the “Carburetor Kit” section for instructions here.How to Adjust a Stihl Weed Eater’s Carburetor Turn the high-speed screw marked ‘H’ counterclockwise until it comes to a complete stop. If this is the case, you may need to clean out a clogged or gummed up carburetor or replace some of the smaller parts by purchasing a carb kit. Some carburetors are fixed, meaning they have no adjustments. When you have the engine running at its best, the problem will be solved (note: this does require some experience and may take a few times to get it right). Next, at full throttle, turn the H screw clockwise to set the high idle. Then, start by turning the L screw clockwise to add more fuel and set the idle. Once the engine is running again, allow it to idle for about a minute. It may run a little rough at first, but it should start at these settings. Turn both screws in to shut off fuel then turn them the opposite direction 2 turns and start the engine. One should be marked L (low) and one marked H (high). You will also want to locate both idle screws on the carburetor. Adjusting these settings to lean out the fuel flow will solve the problem. Sometimes the adjustment screws are improperly adjusted and therefore the engine is not getting enough air. Next, check for any adjustment screws that the carburetor may have. At this point you will want to look for any obstructions in the way that could block air flow, and ultimately starve the engine of oxygen. You will find the carburetor underneath the air filter, and once you have located it you can remove the air cleaner cap. A fouled or poorly adjusted carburetor can cause your hedge trimmer’s engine to idle, but die when power is increased.
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