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Guide to Testing Motorcycle Spark Plugs

Step-by-step guide to testing spark plug condition using multimeter, including proper testing techniques, reading interpretation and maintenance recommendations.

  • 26 Mar 2025
  • 3 min read
  • 36 views

Spark plugs are the practical parts of internal combustion engines because they ignite the air and fuel mixture to initiate combustion, powering the engine. However, these wear out or get dirty with time, affecting the whole engine.

Vehicle owners need to know how to check spark plugs. This will help ensure the performance and longevity of the engine.

Steps on How to Check the Spark Plug

Understanding the different parts of a spark plug is crucial when checking for its issues. This knowledge will help you in spotting any visible signs of wear and tear. Now, how do you check a spark plug? The best way to examine a spark plug is by using a multimeter, an instrument that reads resistance.

1) Set Up The Multimeter

First, set the multimeter to the twenty K-ohms range. This will enable you to measure the spark plug's resistance and confirm its working.

2) Multimeter Probes Positioning

Grip the two multimeter probes with care. One should be placed on the terminal of the spark plug (the point to which the spark plug wire is fastened), and the other on the top of the central electrode.

3) Check for a Reading

The multimeter reading ranges between 5 and 15 ohms for well-functioning spark plugs. This resistance allows them to withstand and carry a charge efficiently. If there’s no reading, it could mean a break in the connection, which shows that the spark plug is defective.

4) Avoid False Readings

Do not place the probe on the nut or any outside metal part of the terminals and the central electrodes. If a reading is established between these two points, erosion or damage is suggested, implying that the spark plug should be replaced.

Conclusion

Testing a spark plug is a very simple task that can enhance the lifespan of your car and avert surprise complications. A malfunctioning spark plug can be detected early by using the multimeter in conjunction with a visual inspection of the part to avoid compromising engine performance.

Obtaining comprehensive two-wheeler insurance with necessary add-ons like engine protection cover will compensate you financially in case of any repair to the parts related to the engine.


Disclaimer: The information provided in this blog is for educational and informational purposes only. It may contain outdated data and information regarding the Insurance industry and products. It is advised to verify the currency and relevance of the data and information before taking any major steps. ICICI Lombard is not liable for any inaccuracies or consequences resulting from the use of this outdated information.  

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