What Spark Plug Does a Stihl MS170 Chainsaw Take? Detailed

When maximizing the performance of your Stihl MS 170 chainsaw, one important component you cannot overlook is the spark plug. The Stihl MS 170 spark plug is the ignition source for the fuel-air mixture to generate power for your saw.

Choosing the right spark plug can improve your chainsaw’s power, efficiency, and overall performance. This article explores the significance of the Stihl MS 170 spark plug and its impact on the chainsaw’s performance.

learn about stihl ms170 spark plug

By understanding the Stihl MS 170 spark plug’s function, maintenance requirements, and compatible options, you can optimize your chainsaw’s operation and extend its lifespan. Let me dive into the details.

Recommended Stihl MS 170 Spark Plug

Here are some of the other specifications of the NGK BPMR7A spark plug.

NGK (6703) BPMR7A Spark Plugs

  • Thread Length: 9.5mm
  • Thread Size: 14mm
  • Heat Range: 7(medium)
  • Hex Bolt Size: 19mm(3/4”)
  • Gap: 7mm(0.28”)

The Stihl MS 170 chainsaw uses a standard-resistor NGK spark plug with an electrode gap. The recommended spark plug for the Stihl MS 170 is the NGK BPMR7A. BPMR7A refers to the spark plug number of the Stihl MS 170.

This spark plug features a built-in resistor that helps to reduce electromagnetic interference and electric noise, thus preventing interference with sensitive electronic components in the chainsaw.

There are many variations of the variations of Stihl chainsaw spark plugs, with each differing in terms of the size of the electrode gap. This typically ranges from 0.5 to 0.7mm or 0.020 to 0.030 inches.

However, each Stihl chainsaw model requires an NGK spark plug with a specific electrode gap. It would be best to refer to your manufacturer’s manual to find the correct spark plug gap for your specific model. For the Stihl MS 170, this value is typically 0.020”.

The NGK BPMR7A spark plug has a medium heat range, enabling it to dissipate heat easily from the combustion chamber. This also shows it can work effectively under different temperature ranges and operating conditions.

These spark plugs come in a box with an electrode protector. You can easily find them in automotive stores and outdoor power equipment retailers. Alternatively, here is the NGK BPMR7A spark plug for Stihl MS 170 that you can easily find.

Understanding the Stihl MS 170 Spark Plug’s Function

Understanding Stihl MS 170 Spark Plug’s Function

The spark plug is the source of ignition for your chainsaw’s engine. How does it function? It produces an electric spark across a small gap, igniting the compressed fuel-air mixture in the combustion chamber.

A controlled explosion ensues, which helps push the pistons down and generate raw power that starts the engine and drives the chainsaw’s chain to cut wood efficiently.

Importance of a Properly Functioning Stihl MS 170 Spark Plug

Importance of Properly Functioning MS 170 Spark Plug

Below are some of the main benefits of having a properly functioning Stihl MS 170 spark plug:

Efficiency and Power

Using the right spark plug type will help ensure your chainsaw’s combustion process is more efficient. This will unlock the true potential of your chainsaw by providing the optimal power output.

Conversely, using a faulty or wrong type of Stihl MS 170 spark plug can result in engine misfires, reduced power, and poor fuel consumption.

Smoother Engine Operation and Performance

The spark plug is directly responsible for engine performance and smooth operation. With the right spark plug, you can easily start your saw. Additionally, it can idle stably and deliver consistent power throughout the operation.

A worn-out or dirty spark plug can cause the engine to sputter, stall, and decrease the overall cutting performance.

Stihl MS 170 Spark Plug Cross References

Stihl MS 170 Spark Plug Cross References

There are two main spark plugs that you can use as alternatives for the NGK BPMR7A if you cannot access it. They are mainly: the RCJ7Y manufactured by the Champion brand and WSR7F by Bosch.

Although both models are not the original equipment manufacturer (OEM), they offer reliable performance and compatibility.

Stihl MS 170 Spark Plug Replacement

Stihl MS 170 Spark Plug Replacement

The spark plug should be checked and replaced regularly to ensure optimal performance and reliable ignition. As a rule of thumb, you should replace your spark plug after 100 operating hours or at least once per year, whichever will come first.

Here is the step-by-step procedure that you can follow to do a Stihl MS 170 spark plug replacement to ensure reliable ignition and optimal chainsaw performance:

Step 1: The first thing you should do is gather all the necessary tools for the replacement process, which include safety glasses, a new spark plug, socket wrench, gap gauge, and wire brush.

Step 2: Prepare the chainsaw for spark plug replacement by turning it off, disconnecting the spark plug wire, and using a clean cloth to wipe away any dirt or debris around the spark plug area.

Step 3: Remove the old spark plug using a socket wrench to loosen and unscrew the old spark plug in a counterclockwise direction. Do not force it, as you will damage the threads.

Step 4: Examine the old spark plug for signs of wear, deposits, or damage. If the electrode is eroded or covered in black carbon deposits, it is recommended to replace the spark plug.

If there are only small deposits, use a wire brush to clean it ensuring that the electrode remains intact gently.

Step 5: Check the electrode gap using a gap gauge and adjust it if incorrect. Be careful not to bend the ground electrode.

Step 6: Install the new spark plug using the socket wrench to thread it in by tightening it clockwise. Do not overtighten, as it may damage your spark plug.

Step 7:  Reinstall the spark plug wire and gently tug it to ensure it is securely connected. After that, start the chainsaw to ensure it can ignite properly and run smoothly.

You Might Also Be Interested In: How to Measure a Chainsaw Chain

Final Verdict

The Stihl MS 170 spark plug is a critical component of the chainsaw’s ignition system, so it should be properly maintained to ensure top-notch performance. If you’re looking for the right spark plug for your MS 170, I would advise you to go for the NGK BPMR7A, which is highly recommended.

Designed to meet the demands of the Stihl MS 170, the NGK BPMR7A provides reliable starting and efficient combustion, improving your chainsaw’s performance.

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