Check the fuel lines. Ensure the fuel lines are clear of kinks or obstructions. Kinks or obstructions will restrict the flow of gas to the carburetor, causing the engine to run lean and stall. Replace the fuel lines if necessary.
Check the carburetor. If the carburetor is dirty, it will not properly mix fuel with air, causing the engine to run rough and stall. Remove the carburetor and clean it with carburetor cleaner. Replace the carburetor if necessary.
Check the air filter. If the air filter is dirty, it will restrict airflow to the engine, causing the engine to run lean and stall. Remove the air filter and clean it or replace it if necessary.
Check the spark plug. If the spark plug is dirty, worn, or damaged, it will not properly ignite the fuel, causing the engine to run rough and stall. Remove the spark plug and clean it or replace it if necessary.
Check the ignition coil. If the ignition coil is faulty, it will not provide enough voltage to the spark plug, causing the engine to run rough and stall. Replace the ignition coil if necessary.
Check the flywheel key. If the flywheel key is sheared, the flywheel will not turn properly, preventing the engine from starting or running smoothly. Replace the flywheel key if necessary.
