The Ultimate Guide to Choosing Between Resistor and Non Resistor Spark Plugs for Your Motorcycle

Regarding motorcycle repairs and upkeep, spark plugs are a crucial component. Choosing between the resistor and non resistor spark plugs might seem daunting; however, with the correct information, you can make the best decision for your bike.

resistor and non resistor spark plugs

In this blog post, we’ll dive into what sets these two types of spark plugs apart, why one might be better, and how to know which type suits your machine. Read on as we discuss resistor vs. non resistor spark plugs for motorcycle use!

Overview of Spark Plugs and Their Types:

A spark plug is a device that, when connected to an ignition system and energized, creates a spark necessary for fuel combustion. Without these devices, your motorcycle’s engine could not generate power or move you safely down the road.

Spark plugs come in two main types: resistor and non resistor. As their names imply, resistors are designed to reduce electrical interference, while non resistors do not include this feature.

Resistor Spark Plugs:

Resistor spark plugs have a built-in resistor that helps filter out electrical noise from other systems, such as radios, computers, and telephones. This helps reduce potential harm to those sensitive components by reducing electromagnetic interference (EMI).

Resistor spark plugs also have less voltage leakage, meaning the spark will be more vital and more consistent. This can help improve and control engine performance, increase fuel efficiency and reduce emissions. However, resistor spark plugs tend to be more expensive than nonresistor models.

Non resistor Spark Plugs:

On the other hand, non resistor spark plugs do not feature a resistor. As such, they are cheaper than their counterparts but tend to produce weaker sparks with more electrical ignition noise leakage. This can lead to interference with other electronic components when running at high speeds or in extreme heat conditions and can eventually cause those systems to fail.

Which Should I Choose For My Motorcycle?

When selecting a spark plug for your motorcycle, there are several elements to take into account before making a decision. The type of bike and its electrical components should be taken into consideration when determining what is best suited for it.

Generally speaking, motorcycles with more sensitive electronics will benefit from resistor plugs whereas models without much electronic equipment can opt for nonresistors.

If you’re undecided about the spark plug type to get, get in touch with a skilled technician or check out your nearby motorcycle shop. They are sure to assist you and provide you with valuable advice on which plugs suit your requirements best.

How to Install a New Set of Resistor or Nonresistor Spark Plugs on Your Motorcycle?

Replacing the spark plugs on your motorcycle is easy and won’t take much time. Begin by finding all of the spark plug(s) before taking off any covers or caps that are present. Depending on which model it is, you may require replacing a solo or multiple spark plugs at once.

Unscrew the old spark plug(s) with a socket wrench and quickly fit in your newly bought resistor or nonresistor spark plug. Don’t forget to reattach any cables prior to starting up the engine so that you can ensure your repair was successful!

Advantages and Disadvantages of Resistor Spark Plugs:


Resistor spark plugs have many advantages, including

  • better engine performance
  • increased fuel efficiency
  • reduced emissions.

They also feature fewer voltage leaks which can help reduce interference with other electronic components.


  • more expensive than non resistor plugs
  • Unsuitable for those on a budget.
  • They may produce weaker sparks under certain conditions, such as extreme heat or high speeds.

Advantages and Disadvantages of Nonresistor Spark Plugs:


  • cheaper than resistor models
  • Don’t require a special socket for installation.


  • weaker sparks with more electrical noise leakage
  • susceptible to interference from other electronic components
  • It can eventually cause those systems to fail.

Factors to Consider When Choosing Between Resistor and Non resistor Spark Plugs for Motorcycles:

When choosing between a resistor and non resistor spark plug for your motorcycle, you should consider a few essential factors.

  • Firstly, if you have a newer model bike with intricate electronic components, it is essential to assess the type of vehicle and any installed parts. The best choice for these sensitive bikes may be resistor spark plugs in order to provide optimal performance.
  • Secondly, it’s also worth considering your budget. Nonresistor models are cheaper than their resistor counterparts but should only be used if suitable for your motorcycle.
  • Finally, research before making your decision by reading customer reviews or speaking to a qualified mechanic or dealership who can advise you on the best choice for your particular bike.

In conclusion, by taking the time to consider all of these factors you should be able to make an informed decision and find the correct spark plug for your motorcycle.


When deciding on the right spark plug for your motorbike, it is vital to take into account all listed criteria before finalizing your selection. Through thorough research and understanding of the available options, you can make sure that you have picked a spark plug fitting for both your bike’s requirements and yours too! Doing so will guarantee that your motorcycle runs at its peak performance – with just the perfect spark plug!

Frequently Asked Questions (FAQs)

What is the difference between a resistor and non resistor spark plugs?

The main difference between a resistor and a non resistor spark plug is that resistor model are designed to reduce electrical noise leakage and interference with other electronic components on your bike. In contrast, nonresistor models are cheaper but may produce weaker sparks.

How do I install a new set of the spark plug(s) on my motorcycle?

Installing a new set of spark plug(s) on your motorcycle is straightforward. First, locate the old spark plug(s) and remove any covering or caps. Fit the new resistor or non resistor spark plug(s) by tightening it securely with a socket wrench. Finally, reconnect any cables or components back into place before starting the engine to test your work.

What factors should I consider when choosing between the resistor and nonresistor spark plugs?

When selecting a new spark plug for your motorcycle, some important factors to consider include the type of bike you have and any electronic components installed on it, as well as budget considerations.

A bad alternator resistor can do the same thing but sounds slightly different from a spark plug noise. It is also helpful to read customer reviews or speak to a qualified mechanic or dealership who can advise you on the best option for your particular bike.

What is a Resistor Spark Plug?

When the spark jumps the gap, it causes a high-frequency energy burst known as RFI (radio frequency interference). As its name suggests, RFI creates static on your radio and interference with other electronic equipment, including the vehicle’s onboard electronic control units (ECUs).