Spark Plug Color Chart
Rounded electrodes with a small amount of deposits on the firing end.
Spark plug color chart. Install new spark plugs. Grayish-tan to white color 2. A yellowish color is typically caused by leaded gas.
Small Engine Normal Spark Plug C7HSAZ10U20FP. Oil fouled see valves or piston rings White no color on spark plug. USE THIS CHART TO CONVERT A SPARK PLUG BETWEEN MANUFACTURERS.
Pinkish-red color on the ceramic insulator tip the center electrode and the ground electrode. Numerous questions have surfaced over the years leaving many people confused. Normal Spark Plug Color.
If everything is good the spark plug should have a tanlight brown color. Furthermore indicating the plug is in the correct heat range. Looking for our John Deere Spark Plug Cross Reference Chart.
Spark plugs are one of the most misunderstood components of an engine. AC Autolite Bosch Briggs and Stratton Champion Plug Denso John Deere Kohler NGK Plug Oregon Stens Tecumseh Torch Popular Applications. Motorcycle Iridium Spark Plug for YAMAHA 500cc IT500.
To cause any detrimental effect on engine performance. Black Soot Buildup Airfuel mixture is too rich the carburetor settings are incorrect or the flame arrestor is dirty or has mounting problems. You can find Images and PDFs from Autolite NGK and other on how to read the color and condition of your spark plugs.
And has been operating in a healthy engine. The brown to greyish tan color and minimal amount of electrode erosion. 2 Stroke Spark Plug Color Chart - manufacturer factory supplier from China.
Oil could be leaking into the cylinders getting past pistons that are. Below we share the spark plug reading chart. K This is often caused by over advanced ignition timing poor engine cooling system.
An engines condition can be judged by the appearance of the spark plugs firing endIf the firing end of a spark plug is brown or light graythe condition can be judged to be good and the spark plug is functioning optimally. Combustion deposits are slight and not heavy enough. Grey to Light Golden-Brown Color This condition is ideal the spark plug and engine airfuel mixture are operating properly.
Note the brown to greyish tan color and minimal amount of electrode erosion which clearly indicates the plug is in the correct heat range and has been operating in a healthy engine. Correct heat range for engine and operating conditions. Firing tip is damp with gasoline usually the odor of fuel is present on the spark plug.
Spark Plug Color Chart. Dark coloring such as heavy black wet or dry deposits can indicate an overly rich condition too cold a heat range spark plug a possible vacuum leak low compression overly retarded timing or too large a plug gap. Your mechanic can offer you advice on what type of spark plug to buy to replace the damaged plug but you may want to consider switching to a hotter spark plug the higher the spark plug number the hotter the plug.
In general a light tangray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition. White colored ceramic insulators are caused by 1 too lean a fuelair mixture 2 too hot a rating for the plug Gray colored plugs can be caused by 1 use of aviation fuel 2 use of certain synthetic oils Super M is one of them Dark plug color can be caused by. If your engine is running too rich the spark plug will be black and sooty.
Dark brown or Black Spark Plug. The information contained in this guide applies to all types of. The pictures and text are from the Autolite technical manual and just made a bit easier to read in the grand scheme of EZ-Read charts here.
Just needed some text that was readable. Normal spark plug. A light tangray or brownish color along with very little electrode erosion indicates optimal operation conditions including a healthy engine and correct spark plug heat range.
Small Engine Normal Spark Plug CR5HSA. A Four-Cylinder Engine With ignition coils over the spark plugs or coil on plug has misfire code for cylinder three or P0303 the plug has a dark grey matt. This guide was designed to assist the technician hobbyist or race mechanic in understanding using and troubleshooting spark plugs.
Brown to grayish-tan color and slight electrode wear. Spark plug heat range is too cold for the operating conditions. Gray or chocolate brown is the ideal color.
Check out the images below courtesy of NGK Spark Plugs and get ready to do a little light reading the next time you pull your spark plugs. When new spark plugs are installed replace with plugs of the same heat range. A clean white insulator firing tip andor excessive electrode erosion indicates this spark plug condition.
The insulator is often tinted the color of charcoal. Red is a sign of iron particle s or rust in the fuel system. Jul 17 2015.
Spark Plug Color Chart - Reading Your Plugs This page is nothing new. This can be caused by a dirty air filter excessive driving at low speeds too rich of a fuelair mixture or idling your vehicle for too long. Black oily deposits on the electrodes and insulator tip points to an oil-fouled plug.
A plug that has racked up miles should have a brownish or grayish color on the insulator and electrodes but some gas additives have been known to turn fresh insulators blue pink or purple. Black oily Spark Plug.
