The clutch drum drive gear engages the blade drive gear and the blades begin to oscillate. When the operator squeezes the throttle trigger, the engine will increase speed from idle to run and the clutch will engage the clutch drum with its drive gear. Likewise, when the primer bulb is pressed, it will draw additional fuel through the carburetor which enters the cylinder before the engine is started. The choke will temporarily restrict airflow through the carburetor so more fuel can enter the cylinder. Two-cycle engines typically have a choke, primer bulb, or both, to assist with starting, especially when the engine is cold. The muffler reduces engine noise while the arrestor prevents burning carbon deposits from exiting the engine and causing injury or potentially starting a fire if the surrounding grass is dry. The exhaust from the hedge trimmer engine travels through a muffler and a spark arrestor. A split-second later, the intake port is exposed again, fresh fuel is drawn in, and the process is repeated with every revolution of the crankshaft. When the piston reaches the top of the cylinder, the spark plug ignites the compressed fuel and air mixture which forces the piston back down, exposing an exhaust port where the spent fuel exits. As the piston travels back up the cylinder, a vacuum is created and gas, oil, and air is drawn through the carburetor into the crankcase. As the piston travels down the cylinder, it exposes an intake port and pumps fuel, oil, and air into the cylinder. This magnetic field induces electricity, allowing the ignition coil to send voltage to the spark plug. The flywheel has permanent magnets built into it and as it rotates past the ignition coil, a magnetic field is created. The rotating crankshaft connects to a piston which moves up and down within the cylinder and the ignition process begins. As the starter rope is pulled, the starter engages the drive cup on the engine’s flywheel and rotates the crankshaft. To start the hedge trimmer engine, the ignition switch must be set to the “start” position. Since hedge trimmers are intended to be hand-held and operated at varying angles to trim and shape hedges, small trees, and shrubbery, a two-cycle engine is ideal for this purpose. The main benefit of a two-cycle engine is that it allows for a high output of torque while being relatively lightweight. Attempting to run a two-cycle engine without a suitable gas and oil mixture will cause the engine to seize due to insufficient lubrication. Two-cycle engines require the gasoline to be mixed with oil for the engine to function properly. While electric hedge trimmers can be powered by an extension cord or battery, most gas-powered trimmers rely on a two-cycle engine to operate. The basics behind how a gas-powered hedge trimmer works There are seven likely causes of a gas-powered hedge trimmer not starting, which we’ll address below right after providing some context of how a hedge trimmer works. However, that versatility is of little use if your hedge trimmer refuses to start. Sure, hedge trimmers keep the hedges even, but this versatile tool is also ideal for trimming small shrubbery, pruning perennials, weeding, and helping small trees retain their shape. Professional landscapers, as well as homeowners who aspire to keep their yard immaculately manicured, know that a hedge trimmer is a crucial component in their landscape maintenance arsenal.
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