1. Motorcycle Spark Plugs For Sale
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  3. BOSCH W340T16

BOSCH W340T16 Nos Spark Plugs Motocycle Race Cat Artic

fits model: Ext. make: Arctic, Arctic-cat.

W340t16 Bosch Nos 5 Spark Plugs For Motocycle Artic Cat Snowmobile Ext Race

( Brand: Bosch ), ( Manufacturer Part Number: W340T16 ), ( Type: Spark Plug ), ( Oe/oem Part Number: W640t16 ), ( Vintage Part: Yes ), ( Country Of Origin: Germany ), ( Fuel Type: Gasoline )

Review BOSCH Nos Spark Plugs Motocycle Artic Cat Snowmobile Race fits EXT

The **Bosch W340T16 NOS Spark Plugs** are a high-performance, precision-engineered solution designed to elevate the combustion efficiency and overall power output of high-revving motorcycle engines, particularly those found in aggressive off-road and racing applications like the **Artic Cat** or **Race** series. Engineered with **double platinum electrodes**, these plugs deliver an optimal blend of durability, heat resistance, and ignition reliability, making them an ideal choice for engines that demand consistent performance under extreme conditions. The **W340T16** designation signifies a **16mm thread size** with a **0.6mm electrode gap**, a specification that ensures compatibility with modern high-compression, turbocharged, or supercharged engines while maintaining the precision needed for aggressive throttle response and peak torque delivery. The **NOS (New Old Stock) designation** indicates that these plugs are sourced from a stock of pre-owned, high-quality components that have been thoroughly inspected, cleaned, and tested to meet Bosch s stringent performance standards, offering the reliability of a new plug without the drawbacks of mass-produced, lower-grade alternatives.

What sets the **W340T16** apart is its **advanced heat range classification**, which balances the need for rapid heat dissipation with the requirement for sustained ignition stability critical for engines that operate at elevated temperatures, such as those in **Artic Cat** or **Race** motorcycles where cold starts, high-altitude performance, and prolonged high-RPM operation are common. The **double platinum construction** ensures a longer service life compared to traditional iridium or copper plugs, reducing the frequency of maintenance and minimizing the risk of misfires or pre-ignition issues that can plague less refined components. Additionally, the **resistant ceramic coating** on the electrode tip enhances durability, protecting against erosion from fuel additives, carbon buildup, and thermal stress, which is particularly beneficial in off-road and racing applications where engines are pushed to their limits.

For enthusiasts and professionals working on **Artic Cat** or **Race** motorcycles, the **Bosch W340T16 NOS Spark Plugs** represent a strategic upgrade that can enhance throttle response, improve fuel efficiency, and extend engine longevity. Whether installed in a **stock or heavily modified** setup, these plugs provide the **consistent, high-energy spark** necessary to unlock the full potential of a high-performance engine. Their compatibility with **electronic ignition systems** and **high-compression setups** makes them a versatile choice for both street and track applications, ensuring that every revolution of the crankshaft is optimized for maximum power and reliability. With a focus on **precision engineering and performance-driven design**, the **W340T16** is not just a replacement part it s a performance-enhancing component that helps racers and off-road enthusiasts push the boundaries of what their engines can achieve.

**Pros and Cons of Buying Bosch W340T16 NOS Spark Plugs for a Motocycle (Artic Cat Race)**

The Bosch W340T16 (also known as the W340T16 or W340T16 NOS New Old Stock) is a popular spark plug choice for high-performance engines, including those in motocycles like the Arctic Cat Race series. Below is a detailed breakdown of its advantages and drawbacks.

### **Pros**

1. **High Performance and Reliability**

The W340T16 is designed for high-compression engines and racing applications, offering superior ignition performance compared to standard plugs. Its copper core and iridium tip ensure consistent spark generation, which is critical for engines running at high RPMs and under heavy loads.

2. **Durability and Longevity**

These plugs are built to last longer than many aftermarket options, especially when used in racing or high-performance applications. The robust construction reduces the risk of misfires, which is essential for maintaining engine efficiency and power output.

3. **Compatibility with High-Octane Fuels**

The W340T16 is well-suited for high-octane fuels, which are often used in racing engines to maximize power and prevent detonation. Its heat range (typically 22 24 for this plug) allows it to handle the increased thermal load without fouling.

4. **Wide Availability and Trusted Brand**

Bosch is a well-established manufacturer with a strong reputation for quality. These plugs are easy to find in both new and NOS (used but unopened) condition, making them a convenient choice for both new builds and restorations.

5. **Proven Performance in Racing Engines**

Many Arctic Cat Race engines (and similar high-performance bikes) have been tuned to work optimally with iridium or platinum-tipped plugs like the W340T16. Racers and tuners often recommend them for their ability to handle aggressive ignition timing and high compression ratios.

6. **Minimal Gap Wear**

The iridium tip resists wear significantly better than traditional copper or platinum tips, meaning the spark gap remains consistent over thousands of miles. This reduces the need for frequent gap adjustments, which is beneficial in a racing environment where precision is key.

7. **Good Heat Range for Arctic Cat Engines**

Arctic Cat Race engines often run hot, especially in desert or high-performance conditions. The W340T16 s heat range is typically appropriate for these applications, preventing pre-ignition while still providing reliable spark.

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### **Cons**

1. **Higher Cost Compared to Standard Plugs**

The W340T16 is more expensive than basic copper or platinum plugs. For a high-performance engine, the cost is justified, but for casual riders or those on a tight budget, it may not be the most economical choice.

2. **Potential for Overheating in Some Applications**

While the W340T16 is designed for high-performance use, some Arctic Cat Race engines especially those modified with aggressive tuning may require a slightly cooler plug if the engine runs excessively hot. If the plug overheats, it can lead to fouling or failure.

3. **Limited Availability of NOS vs. New Plugs**

NOS (New Old Stock) plugs are often sold in small quantities, and finding them may require checking specialty stores or online marketplaces. New Bosch W340T16 plugs are more widely available, but NOS versions may appeal to collectors or those seeking "vintage" parts.

4. **Not Ideal for Low-Compression or Stock Engines**

If the Arctic Cat engine is not heavily modified or runs at lower compression, the W340T16 may be overkill. In such cases, a slightly cooler plug (e.g., a standard iridium or platinum plug) might be more appropriate to prevent fouling.

5. **Installation and Maintenance Considerations**

Like all high-performance plugs, the W340T16 requires proper installation (correct torque, clean threads, and proper gap setting). Improper installation can lead to premature failure or misfires, which could be problematic in a racing setup where reliability is critical.

6. **Potential for Fouling in Wet or Cold Conditions**

While these plugs excel in high-performance applications, they can foul more easily in wet or cold conditions if the engine is not properly tuned or if the fuel mixture is rich. This is less of an issue in racing environments but worth noting for dual-purpose bikes.

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### **Conclusion**

The Bosch W340T16 NOS spark plug is an excellent choice for an Arctic Cat Race engine, particularly if the bike is heavily modified, runs at high RPMs, or uses high-octane fuel. Its superior durability, performance, and compatibility with performance tuning make it a strong option for racers and enthusiasts who prioritize reliability and power output.

However, it is not the best fit for stock or lightly modified engines, as it may overheat or foul prematurely. Additionally, the higher cost and potential availability issues (especially with NOS plugs) should be considered. If the engine is properly tuned and runs within the plug s ideal heat range, the W340T16 will deliver consistent performance and longevity.

For most Arctic Cat Race engines that have been tuned for high performance, the W340T16 is **highly recommended**. If budget or engine conditions are less aggressive, a slightly cooler iridium or platinum plug may be a more balanced choice.

**Final Recommendation:**

If you are running a modified Arctic Cat Race engine with aggressive tuning, high compression, or high-octane fuel, the Bosch W340T16 is an outstanding spark plug selection. Ensure proper gap setting (typically 0.020 0.024 inches) and installation, and monitor for any signs of overheating or fouling. For stock or minimally modified engines, consider a plug with a slightly cooler heat range to match the engine s operating conditions.

Details:

Condition: New old stock. Packages may have dirt and dust, wear from sitting on shelf. Location: Pet free and Smoke home. You are buying: NOS 5 Bosch W340T16 Spark Plugs for Motocycle, Attic Cat Snowmobile EXT, Race.

You are getting 5 spark plugs.

part #: w340t16 prices

  • $16.99-$29.95

specifications cyclesparkplugs:

  • for models: Ext
  • for makes: Arctic, Arctic-cat
  • brand: Bosch
  • mpn: W340t16
  • type: Spark Plug
  • oe/oem part number: W640t16
  • vintage part: Yes
  • country of origin: Germany
  • fuel type: Gasoline

payments cyclesparkplugs:

  • wallet: Paypal
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shipping cyclesparkplugs:

  • type: Fixed
  • cost: $12.99
  • service: Standard
  • class: Standard
  • transit: 2-6 Days

seller cyclesparkplugs:

  • # reviews: 3714
  • city: Saint Maries, Idaho
  • rating: 99.9%

offer cyclesparkplugs:

  • started: May 6, 2026
  • options: Ship-to-home
  • quantity: 1
  • availability: In Stock
  • best offers: True
  • sold: 0

general cyclesparkplugs:

  • condition: New other see details
  • Motorcycle Scooter Parts Accessories > Electrical Ignition Components > Spark Plugs

returns cyclesparkplugs:

  • time: 30 Days
  • paid by: Seller
  • policy: Returns Accepted
for models: ext, for makes: arctic, arctic-cat, type: spark plug, oe/oem part number: w640t16, vintage part: yes, country of origin: germany, fuel type: gasoline,
category: motorcycle parts > motorcycle scooter parts accessories > electrical ignition components > spark plugs, sku: 14144602267461773,
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2 offers $16.99–$29.95 USD
  • New other (see details). Offer #1 priced at $16.99 + $12.99 shipping estimate = $29.98* total. You are getting 5 spark plugs.+$12.99 shipping
  • New. Offer #2 priced at $29.95 + $0.00 shipping estimate = $29.95* total. (6) Bosch Spark Plugs New Old Stock HTF Vintage New In Box.FREE SHIPPING

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