What Does A Good Spark Plug Look Like

Olivia Luz

Crank the engine and observe the tester for spark. The spark plug pictured here. Dry and wet fouling although there are many different cases if the insulation resistance between the center electrode and the shell is over 10 ohms the engine can be started normally.

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If you are experiencing engine problems taking a look at your spark plugs is a good place to start.

If the firing end of a spark plug is brown or light gray the condition can be judged to be good and the spark plug is functioning optimally. There are tons of different types of spark plugs iridium platinum standard pre gapped 4 grounded etc but there still are some telltale visual signs that tell you of a bad spark plug or a poorly running cylinder. A spark plug that is not damaged will appear light grey or possibly tan. If a crisp blue spark is noticed the ignition.

Away from any fuel lines. A bad one looks like. The rule of thumb is light brown or tan colored deposits on the tip of your spark plugs are normal but deposits of different colors and consistencies can be indications of bigger problems. Look for light grey or tan metal on a good spark plug.

Good spark plugs will burn fuel efficiently while bad or failing spark plugs can cause the motor not to start at all. A hot plug may be a good option if your spark plugs are fouled from carbon deposits your engine has a rich air fuel ratio or burns oil or if you do a lot of local low speed driving. There should be no buildup on the sparking surface of the plug. If your motorcycle does not seem to be running right take a look at the spark plugs.

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As you examine it determine what the condition of your spark plug is by matching your spark plug to the photos below. A plug chop will tell you how your engine is running a certain throttle positions. Has some black carbon on the underside of the ground electrode and has black carbon on the base area below the centre electrode not pictured. Whenever you are rejetting or tuning your carburetors a plug chop can take away a lot of the guess work.

If you purchased new spark plugs their colors should be fairly similar. Look at the cylinder side of the spark plug that s the end with the threads and electrode. Once you remove and examine the spark plug look for any signs of visible damage. If your spark plugs are fouled or damaged it can lead to a host of problems including reduced gas mileage slow acceleration engine misfires and trouble starting the engine.

A good spark tester can be made from an old spark plug gapped to 0 200. Spark plugs are a popular item to change and it is important to know what a good spark plug vs.