This arc ignites the fuel air mixture in the chamber, and the trimmer starts. 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. A magnet (located on the flywheel), an ignition coil, and a spark plug. Get ready to discover all our tips and tricks about your STIHL hedge trimmer Whether it’s letting an engine warm up, powering it up to full speed or startin. 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. Take care not to get fuel on your cloth-ing. leakage is found, do not start or run the engine until the leak is fixed and any spilled fuel has been wiped away. If you don't have a spark, you probably have to replace the ignition coil/module. Other hedge trimmer models may have different parts and controls.
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