How To Check Lawn Mower Spark Plug

How to check if lawn mower spark plug is firing with a screwdriver.

After the plugs were cleaned you put them in a machine that pressurized the plug to a few hundred psi then you turn up the voltage and measure how much voltage it takes to fire the plug and checked the plug doesn t arc across the insulator. Then clean the area around the spark plug to avoid getting debris in the combustion chamber when you remove the plug. Annually and in accordance with the operator s manual. The distance between the two metal points on the tip of a spark plug is referred to as the spark plug gap measure the spark plug gap with a spark plug gauge and compare that measurement to the measurement called for in the lawn mower s owner s manual.

If a spark is present the ignition coil is working properly. Using an ohmmeter to test a spark plug is pretty much useless. Look at the cylinder side of the spark plug that s the end with the threads and electrode. For standard lawn mower and small engine maintenance you should check and or replace spark plugs.

How to check for a fouled or damaged spark plug. If your lawn mower or outdoor power equipment won t start. Remove the engine lid and locate the spark plug. Watch the spark tester or spark plug looking for a spark between the electrodes of the tester or spark plug.

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For the novice who may be asking where is the spark plug on a lawnmower the spark plug can be found beneath the black spark plug wire. An absence of spark will require replacement of the ignition coil. Once you remove and examine the spark plug look for any signs of visible damage. As you examine it determine what the condition of your spark plug is by matching your spark plug to the photos below.

Simply unsnap disconnect the spark plug wire and you can now remove and inspect the lawnmower spark plug. It s how you can check for the fire spark using a screwdriver or screwdriver test light. Remove the spark plug using a spark plug socket. When i worked at a small airport one summer i tested spark plugs.

Check and adjust the spark plug gap if necessary. Check for the ignition coil and pop it off from the spark plug. Disconnect the spark plug lead.