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Home»TECHNICAL TIPS»Troubleshoot»bad spark plug signs-Common Signs of Bad Spark Plugs
Troubleshoot

bad spark plug signs-Common Signs of Bad Spark Plugs

February 1, 20263 Mins Read
signs of bad spark plug
signs of bad spark plug
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Spark plug is one of the most important parts of a bike. Spark plug plays a major role in starting the bike engine. As such it can be called the engine key.

All those who ride bikes regularly know that different parts of the bike have to be serviced or some parts have to be changed.

Spark plug is one of them. According to the book, the spark plug of the bike should be cleaned after every 1000 km and changed after 4000 km.

However, depending on the driving style, it may break even before 4000 km and it can give service like brand new even at 30000 km.

There are two main reasons for Zcon spark plugs to fail.

Read more: Why are spark plugs so important to your bike engine?

If the mixture of air and fuel of the engine is not correct:

If the mixture of air and fuel in the engine of the bike is not at the right level, then oil will flow into the spark plug. This will cause the spark plug to become oily. As a result, the spark plug cannot spark properly. will lose its effectiveness.

If water enters under any condition:

If the bike’s spark plug gets wet in rain or while washing the bike, and if you try to start the bike in this condition, the spark plug may burn.

Generally bike spark plug wear is very low, in most cases its power is reduced. When its power is reduced, its effect is on the engine.

The question is how do you know that the bike’s spark plug needs to be changed. Let us use a picture to understand the matter

First Image: In this image, the spark plug is brown in color. This is the most normal and natural position of the spark plug. If your bike’s spark plug is in this condition, wipe it lightly. In this condition you can run for several more days.

In this image the spark plug is brown in color
In this image, the spark plug is brown in color.

2nd Image: In this image it is seen that the top part of the spark plug is brown but its body is black. This means the spark plug is at risk. It’s best if you change it. But it has its function. You can run for quite a while longer with the cleaner.

the spark plug is brown but its body is black
spark plug is brown but its body is black

3rd Image: This image shows the spark plug completely black. You will see oil in many fields. If you touch it with your fingers, you will get ink on your hands. This spark plug is almost dead. Under no circumstances should a wet or oily spark plug be installed.

This image shows the spark plug completely black
spark plug completely black

The spark plug of the bike may need to be damaged or changed due to several other reasons, such as, if the porcelain part with the spark plug gets cracked or the patch of the spark plug is cut or the sparking part of the spark plug is broken, etc.

Curious about Troubleshoot? We've got more info in this linked article. Is Decel Popping Bad for Motorcycle?

conclusion

If you want to get maximum service from your beloved bike, it needs to be monitored regularly. If there is a problem with something, it should be repaired or replaced.

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Robert Jackson
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Hi, I’m Robert Jackson, a writer at Biker Guides. I’m passionate about motorcycles and dedicated to sharing helpful insights with fellow riders. On this blog, I cover technical tips, maintenance advice, and common bike FAQs to make your biking experience smoother, safer, and more enjoyable.

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