DIY – How to Read & Change A Motorcycle Spark Plug -It’s Easy!

Get Ready For Upcoming Riding Season and save some money to. Here is a complete guide to all you need to Know About Motorcycle Spark Plugs maintenance for the four cycle motorcycle. If you own a motorcycles and want to save some money on servicing then one of the easiest things to do is change your Motorcycle Spark Plugs yourself. It’s easy, not too messy and most likely you have the tools to do it yourself! OK, By “reading” the color and condition of the plug you can tell a lot of things about your Motorcycle.

You are going to need to loosen and remove your Motorcycle Spark Plug with a wrench or socket wrench. Turn in an anti-clockwise direction and remove the plugs.

How do I “read” a spark plug? Easy..

Tops of spark plug are covered in white ceramic insulation. An engine’s condition can be judged by the appearance of the spark plug’s firing end.

Motorcycle Spark Plug in Normal Condition

If the firing end of a spark plug is brown or light gray, tan or gray indicates that the engine is running efficiently and the spark plug’s type is correct..

Ash deposits

The Motorcycle Spark Plug has ash deposits which are light brownish deposits that are on the ground and center electrode. This is caused by excessive amounts of oil in the combustion chamber or bad quality fuel. It can cause misfire’s.

Carbon fouling

A black dry and black sooty deposits. This will lead to misfire and week a spark. Usually caused by an overreach fuel to air mixture or blocked air filter.

Wet fouling

A wet and oily deposit on the Motorcycle Spark Plug end will lead to misfire and a weak spark. Symptoms: Most likely caused by oil leaking past the piston rings or valve guides on a four stroke engine.


When a spark plug overheats, deposits accumulated on the insulator tip melt and give the tip a white blistered glazed appearance. Usually caused by ignition system failure or cooling system failure. This is a very dangerous condition and must be corrected.

Worn plugs

Symptoms: Rounded electrodes with a small amount of deposits on the firing end. Normal color. Causes hard starting in damp or cold weather and poor fuel economy. Don’t waste your fuel by some new Motorcycle Spark Plugs. Replace with new plugs of the same heat range.

Think how much money you saved on garage fees and you get the satisfaction of knowing that the job has been done right!

Source by Alexander Minor

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