When you start your lawn mower or small engine, you turn the flywheel and its magnets pass the coil (or armature). This creates a spark. … Once the engine is running, the flywheel keeps rotating, the magnets keep passing the coil and the spark plug keep firing based on a specific timing.
Why is my lawn mower not getting spark?
If you don’t see a spark on the tester, there may be a problem with the ignition coil of the flywheel to which it’s attached. The ignition coil doesn’t frequently develop problems, but the connection between the flywheel and coil or between the starting pulley and flywheel can wear out, and the coil may not be turning.
How does a lawn mower ignition system work?
The ignition system starts a lawnmower and keeps it running by generating enough electric current to jump the gap between the electrodes of a spark plug, and to create a spark to ignite fuel in the combustion chamber.
What could cause no spark?
Loss of spark is caused by anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap.
What does weak spark look like?
A red or yellow spark is weak and probably will not spark in the cylinder. A blue or white spark is strong and has enough voltage to fight across the spark plug gap even under pressure within the cylinder. Click to see full answer.
What happens if you use the wrong spark plug in a lawn mower?
The engine may not start. And, if it does, using too cool of a plug may cause it to foul either causing the engine to stall, or make future starts after the initial, difficult.
How do I fix no spark?
First Confirm Your Engine Has No Spark.
- Disable the fuel system by removing the fuel pump fuse or relay.
- Insert a spark plug tester into the plug boot and ground it on a piece of metal on the engine.
- Finally, Have someone crank the engine and watch for spark.
7 апр. 2020 г.
How do I know if my lawn mower coil is bad?
Replace the original wire with the in-line spark tester, and attempt to start the motor. Watch for the same intensity of a spark that you saw when the mower was cold, If there is little or no spark, the ignition coil is bad and needs replacement.
How can you tell if an ignition coil is bad?
Signs of a Bad Ignition Coil
- Illuminated Check Engine Light. With most modern vehicles, a faulty ignition coil is enough to turn on the Check Engine Light. …
- Misfiring Engine. If an ignition coil is not working properly, your engine will likely misfire. …
- Hard Starts. …
- Worsening Gas Mileage. …
- Diminished Power. …
- Sudden Backfires.
What does a coil do on a lawn mower?
The starter coil – more commonly referred to as the ignition coil – in a lawn mower is an essential component because it is responsible for transferring voltage from the battery to the spark plug, which results in the spark that starts the mower.
How does the ignition system work on a small engine?
An ignition system in a small engine produces and delivers the high-voltage spark that ignites the fuel-air mixture to cause the combustion. Some small engines require a battery to supply electrical power and the ignition spark. Others develop the ignition spark using a magneto.
How is no spark condition diagnosed?
If the engine has no spark, check for voltage at the coil positive terminal when the ignition key is on. If there is voltage, the problem is on the trigger side of the coil (pickup, crank sensor, ignition module or primary wiring circuit).
Can a relationship work with no spark?
True monogamists are not afraid of the lack of spark or butterflies; that wonderful but ultimately transient and even shallow feeling of being in a state of love. … If you are that person who has ended a long-term relationship over not feeling the magic, then you owe it to yourself and others to become a polyamorist.