Small gasoline-powered engines, such as those used in lawn and garden equipment like lawnmowers, rototillers and snowblowers, utilise a flywheel to help generate spark to the spark plug. The flywheel also provides inertia to help the piston through the four strokes of the engine cycle. When the ignition system isn't generating spark, the repair procedure will likely entail removing the flywheel. While using a flywheel puller is often the easiest way to remove a flywheel, you can pull a flywheel without a puller.
Disconnect the spark plug wire from the spark plug, and secure the wire away from the tip of the spark plug.
Loosen and remove the bolts that secure the starter housing to the engine. Lift the housing off of the engine, and set aside.
Position a flywheel holder on the right side of the flywheel, with the hooked tip inserted into one of the fins on the far side of the flywheel. Hold the flywheel with the flywheel holder securely with your right hand, and place a clutch removal tool over the clutch with your left hand. Rotate the clutch counter-clockwise to remove the clutch. Set the clutch, the clutch removal tool and the flywheel holder aside.
Thread a knockout tool onto the crankshaft. Hand tighten the knockout tool against the flywheel, then back the knockout tool off one full turn from the flywheel.
Hit the end of the knockout tool squarely with a hammer. The flywheel should pop loose.
Spin the knockout tool counter-clockwise to remove it from the threaded crankshaft. Lift the loosened flywheel off of the crankshaft.