Spark plug gap: Ensure the spark plug gap is set to the manufacturer's specifications. An incorrect gap can result in a weak or no spark.
Spark plug wire: Check the spark plug wire for damage, cracks, or loose connections. Replace if necessary.
Spark plug cap: Inspect the spark plug cap for damage or cracks. Replace if needed.
Spark plug: Replace the spark plug if it is worn out or damaged.
2. Ignition coil problems:
Ignition coil: Test the ignition coil using a multimeter to check for continuity and resistance. Replace the coil if it is faulty.
Ignition coil connections: Ensure the ignition coil is securely connected to the spark plug wire and the engine's electrical system. Clean any corrosion or dirt from the connections.
3. Electrical system issues:
Battery: Check the battery voltage and connections. A weak battery or loose connections can affect spark production.
Wiring: Inspect the electrical wiring for damage, loose connections, or corrosion. Repair or replace any damaged wires.
Grounding: Ensure the engine is properly grounded. Clean any corrosion or loose connections on the grounding wire.
4. Magneto problems (if applicable):
Magneto: If your Cub Cadet SRC621 has a magneto ignition system, check the magneto for damage, wear, or faulty components. Replace the magneto if necessary.
5. Safety features: Some lawnmowers have safety features that prevent the engine from starting unless certain conditions are met, such as the operator being seated or the safety switch being activated. Check the operator's manual for specific instructions on how to override or bypass these safety features if necessary.
If you have checked all these components and still don't have a spark, it's best to consult with a qualified small engine repair technician or refer to the Cub Cadet SRC621 service manual for further troubleshooting steps and repair instructions.
