If you are unable to do this procedure, then you could order a replacement carburetor, or better still, if you are still under warranty, arrange for your machine to be collected and repaired by our workshop technicians. The screw should be turned anticlockwise until the machine struggles to rev to max rpm (revolutions per minute), then turned slowly clockwise until the engine picks back up to max RPM.To adjust the H screw the machine needs to be run on full throttle whilst adjusting the screw.Firstly turn the L screw until the engine ticks over comfortably without the strimmer engaging.There are 2 adjustment screws on the carburetor, L which refers to low speed, and H which refers to high speed.Tools needed: Carburettor adjustment 'pacman' tool Please contact our helpline if you think you are unable to proceed: Doing this wrong could make the problem a lot worse. Replace the damaged or severely clogged screen. A light brushing with a brass wire brush removes most carbon buildup. yes no Mix 2 1/2 fluid ounces of two-cycle engine oil with one gallon of 89 octane unleaded gasoline. Slide the spark arrestor screen out and clean it if needed. Remove the screw in the upper right corner of the Stihl HS 80 muffler when the engine is completely cold. This is a procedure which requires a high-level of mechanical skill, so please be wary before trying it. Find the muffler port at the right side of the engine. It is quite likely that your carburettor settings need adjustment in order for machine to engage in idle speed properly again. Fuel cap: Make sure it's hand-tight (not too tight or too loose).Air filter: Make sure it is clean and unclogged.Fuel: Make sure it is fresh and correctly mixed (see 'Starting Issues').If the engine is not running at idle speed and cuts out when you release the throttle trigger, then you need to do the following checks: This article will cover the soft fixes you can take if your hedge trimmer is not idling. Modified on: Fri, 30 Apr, 2021 at 3:16 PM This arc ignites the fuel air mixture in the chamber, and the trimmer starts.Solution home Petrol Hedge Trimmers Petrol Hedge Trimmer Troubleshooting My Petrol Hedge Trimmer will not idle As they jump, they produce an electric arc (also known as a spark). The electrons want so badly to return home (ground), they jump the gap in the spark plug. This current travels through the ignition wire to the spark plug. When the magnet on the flywheel spins past the ignition coil, a current is induced. When you turn the engine (pull the cord), the flywheel rotates. However, this airflow could be interrupted for a variety of reasons. Simply put your trimmer down, and give it a break. This air needs to be cool and will mix with the fuel. This is by far the easiest problem to solve, out of all the reasons for your electric trimmer not starting. A magnet (located on the flywheel), an ignition coil, and a spark plug. Restoring Air Circulation Having good air circulation is perhaps one of the most important parts of the engine process. The ignition system is made up of 3 major parts. If you have a weak spark, try cleaning, regapping, or replacing the spark plug. Your model may vary, but the procedure will be similar. There's a good YouTube video that shows how to replace a lawn trimmer ignition coil. If you don't have a spark, you probably have to replace the ignition coil/module.
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