DUCATI 67040071A Champion Spark Plug RA4HC 905 620

( Manufacturer Part Number: 67040071A ), ( Type: Spark Plug ), ( Configuration: Single ), ( Fuel Type: Gasoline )

Review DUCATI Oem Champion Spark Plug 620 fits SUPERSPORT ST2 600 1990–2005

The **Ducati 67040071A RA4HC Champion 905 Spark Plug** is a precision-engineered ignition component designed exclusively for Ducati s high-performance motorcycles, including the iconic **Supersport 600 ST2 (90-05 models)** and the **620cc ST2**, as well as the **RA4HC (Racing Academy 4-Horsepower Champion) variants** of these bikes. Crafted from high-grade **nickel alloy with a fine platinum-iridium tip**, this spark plug delivers an optimal blend of durability, reliability, and performance, ensuring consistent ignition even under the demanding conditions of aggressive riding, track use, or high-revving applications. The **905 designation** indicates a heat range tailored for Ducati s high-compression, fuel-injected engines, striking a balance between thermal efficiency and resistance to fouling critical for maintaining peak power output and throttle response. Its **threaded design (M14 x 1.25 mm)** and **19 mm shell diameter** ensure a secure, vibration-resistant fit within the cylinder head, while the **RA4HC-specific engineering** accounts for the modified camshaft profiles and increased airflow of these racing-inspired models, promoting cleaner combustion and reduced carbon buildup. Ideal for both street and track use, this plug is engineered to withstand the thermal stresses of high-RPM operation while minimizing pre-ignition risks, making it a trusted choice for Ducati enthusiasts seeking to preserve engine longevity without sacrificing performance. Whether used in stock configurations or as part of a performance upgrade, the **Champion 905** exemplifies Ducati s commitment to precision engineering, delivering a spark plug that bridges the gap between reliability and raw power.

### **Pros and Cons of buying a Ducati 67040071A RA4HC Champion 905 Spark Plug (Compatible with 90-05 Supersport 600 ST2 620)**

1. **OEM Quality** This is an original Ducati part, meaning it meets the manufacturer s specifications for performance, durability, and reliability. It is designed to work seamlessly with Ducati engines, ensuring proper ignition timing and power output.

2. **Enhanced Ignition Performance** The Champion 905 plug is optimized for high-performance engines, providing better spark strength and consistency compared to standard plugs. This can lead to improved throttle response, smoother power delivery, and better fuel efficiency in some cases.

3. **Durability** Champion is a well-regarded brand known for producing high-quality spark plugs that last longer than many aftermarket alternatives. The RA4HC (Resistorless, Automotive, 4 mm thread) variant is designed for durability in high-revving engines like those in the Supersport 600.

4. **Compatibility** This plug is explicitly listed for Ducati models from 1990 to 2005, including the Supersport 600, ST2, and 620. It fits the engine bay without modification, making installation straightforward.

5. **Easier Maintenance** Since it is an OEM or high-quality aftermarket part, replacing it is a simple DIY task that doesn t require specialized tools beyond a spark plug socket and gap tool. Many riders prefer keeping maintenance in-house to save on labor costs.

6. **Potential Performance Boost** If the original plug was worn or faulty, upgrading to this Champion plug could restore or even slightly improve engine performance, especially in terms of starting reliability and power output.

7. **Widely Available** Champion plugs are stocked by most motorcycle parts retailers, both online and in physical stores, making them easy to source without long wait times.

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1. **Cost** While not excessively expensive, this is still a premium part. Compared to generic or budget spark plugs, it may cost more upfront. For example, a single Champion 905 plug typically retails for around $10 $15, but buying a set (especially if multiple plugs need replacement) adds up.

2. **Potential Overkill for Stock Engines** If the bike is not heavily modified or tuned, the performance gains from this plug may be marginal. For a stock Supersport 600, a standard OEM plug might suffice, and upgrading could be unnecessary unless there are specific issues (e.g., misfires, poor starting).

3. **Installation Complexity** While not difficult, accessing the spark plugs on a Ducati Supersport 600 requires removing the airbox or fuel tank, which can be time-consuming for beginners. Improper handling during installation (e.g., cross-threading) could damage the threads.

4. **Lifespan Expectations** Like all spark plugs, this one will eventually wear out. The Champion 905 is designed for longevity, but it still requires periodic replacement (typically every 10,000 15,000 miles or as recommended in the service manual). Over-reliance on a single plug without regular checks could lead to unexpected failures.

5. **Compatibility with Modifications** If the bike has been heavily modified (e.g., forced induction, aggressive tuning), this plug may not be ideal. High-performance setups often require plugs with different heat ranges or materials (e.g., iridium or platinum) to prevent pre-ignition or fouling.

6. **Limited Warranty** Unless purchased directly from Ducati or an authorized dealer, Champion plugs typically come with a limited warranty (e.g., 1 year). This means if the plug fails prematurely due to a defect, replacement may not be covered.

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The **Ducati 67040071A RA4HC Champion 905 spark plug** is a solid choice for riders looking to maintain or slightly enhance the performance of their 1990 2005 Supersport 600, ST2, or 620. Its OEM-quality build, durability, and compatibility make it a reliable option for both stock and lightly modified bikes. However, it may not be the best investment for heavily tuned engines or riders who prioritize cost savings over premium performance.

For most owners, this plug is a **worthwhile upgrade** if the original plugs are worn or if the bike shows signs of ignition-related issues (e.g., rough idling, hesitation, or misfires). It strikes a balance between performance and practicality, making it a recommended choice for those who value Ducati s engineering standards.

- Your bike is stock or lightly modified.

- You re experiencing ignition problems or want to restore factory performance.

- You prefer high-quality, long-lasting parts for routine maintenance.

- Your bike is heavily tuned (opt for iridium/platinum plugs instead).

- You re on a tight budget (generic NGK or Bosch plugs may work for stock bikes).

- You re unsure about installation (consult a mechanic for the first replacement).

For the average Supersport 600 owner, the Champion 905 plug is a **safe and effective choice** that justifies its cost with improved reliability and performance.

Details:

Includes only the item shown in photos. Genuine OEM New Old Stock NOS motorcycle part. The sale is for one spark plug.

part #: 67040071a prices

• $7.98-$24.00

specifications cyclesparkplugs:

• for models: St2, 600, Supersport
• for makes: Ducati
• for years: 1990-2005
• mpn: 67040071a
• type: Spark Plug
• configuration: Single
• fuel type: Gasoline

returns cyclesparkplugs:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller

offer cyclesparkplugs:

• started: February 4, 2026
• options: Ship-to-home
• sold: 0
• availability: In Stock

payments cyclesparkplugs:

• other
• credit card: Diners-club
• wallet: Apple-pay

shipping cyclesparkplugs:

• transit: 3-7 Days
• type: Fixed
• service: USPS Ground Advantage
• carrier: USPS
• cost: $9.95
• class: Standard

seller cyclesparkplugs:

• rating: 99.9%
• city: Phoenix, Arizona
• # reviews: 12773

general cyclesparkplugs:

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

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