NAMURA ORNA-RA421611-GS Piston Rings Bike 66.35MM

( Brand: Namura ), ( Manufacturer Part Number: ORNA-RA421611-GS ), ( Part Type: Ring Piston )

Review NAMURA Honda Dirt Bike Piston Rings 66.35mm fits CR250 2002–2004

Introducing the Namura OR-A421611-GS piston rings for the 2002-2004 Honda CR250 bike. These high-performance piston rings are designed to deliver superior engine efficiency and durability for off-road racing and high-performance riding.

The piston rings in this set measure 66.35mm in diameter and are precisely engineered to fit the CR250 engine. Each ring is made from a high-quality material that ensures a perfect seal between the piston and the cylinder wall. The outer ring is designed to prevent combustion gases from escaping, while the inner ring controls the oil film for efficient lubrication.

The rings feature a unique ring groove design that enhances gas sealing performance and reduces friction. The top ring also has a narrow groove design to reduce piston-to-cylinder wall contact, which minimizes wear and tear on both the piston and cylinder.

These piston rings are manufactured to meet or exceed OEM specifications for fit, function, and durability. They are also heat-treated to ensure optimal performance in high-temperature racing conditions.

Installing these piston rings is a straightforward process that can be done with common hand tools. They come packaged in a protective sleeve to ensure they arrive in perfect condition.

In summary, the Namura OR-A421611-GS piston rings for the 2002-2004 Honda CR250 bike are a high-performance upgrade for off-road racers and high-performance riders. They deliver superior engine efficiency, durability, and a perfect seal between the piston and cylinder wall. With their unique ring groove design, narrow top ring groove, and heat treatment, these piston rings are an excellent investment for anyone looking to maximize the performance of their CR250 engine.

Buying Namura ORNA-RA421611-GS piston rings for a 2002-2004 Honda CR250 bike comes with several pros and cons that are essential to consider before making a purchase.

1. OEM Compatibility: Namura piston rings are designed to be a direct replacement for the original equipment used in Honda CR250 bikes. This ensures a perfect fit and optimal engine performance.

2. High-Quality Material: Namura piston rings are typically made from high-temperature, wear-resistant materials. This ensures that the rings can withstand the extreme conditions inside an internal combustion engine and provide excellent durability.

3. Reliable Performance: Given their OEM compatibility and high-quality materials, Namura piston rings are known for their reliable performance. They can effectively seal the combustion chamber, reduce engine wear, and improve overall engine efficiency.

1. Cost: Namura piston rings may be more expensive than aftermarket alternatives. However, the improved performance and durability they offer may justify the additional cost for some riders.

2. Availability: Depending on the location and availability of parts, it may take some time to receive the Namura piston rings. It's essential to plan ahead and order them well in advance to avoid unexpected engine downtime.

3. Installation Complexity: Installing piston rings can be a complex and time-consuming process. It may require specialized tools and expertise, which could add to the overall cost and complexity of the repair or maintenance project.

In conclusion, buying Namura ORNA-RA421611-GS piston rings for a 2002-2004 Honda CR250 bike comes with some advantages and disadvantages. While they offer superior performance and durability compared to aftermarket alternatives, they may also be more expensive and require specialized installation skills. Ultimately, the decision to purchase Namura piston rings should be based on your specific needs, budget, and the importance of having a reliable and high-performing engine. If you value the peace of mind that comes with using genuine OEM parts and are willing to invest in their long-term benefits, then Namura piston rings could be an excellent choice for your Honda CR250 bike.

Details:

2002 - 2004 Honda CR250 Dirt Bike Namura Piston Rings 66.35mm: Ring Set Contains: ring to match a single piston. Compatibility: Honda CR250R 1997 - 2004 , Suzuki RM250 1996 2008 , Yamaha YZ250 2014. Piston Size: 66.34 - 66.37mm.: Brand: Namura, model Number: ORNA-RA421611-GS.

Parts without fitment are to be assumed universal and may require vehicle modification. This Namura ring set does NOT fit OEM pistons. This is helpful if you are buying multiple items. I need to exchange an item.

part #: ornara421611 price

• $17.87

specifications pistondon:

• for models: Cr250
• for makes: Honda
• for years: 2002-2004
• brand: Namura
• mpn: Orna-ra421611-gs
• part type: Ring Piston

payments pistondon:

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

returns pistondon:

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

seller pistondon:

• rating: 99.5%
• city: Indiana, US
• # reviews: 64680

offer pistondon:

• sold: 0
• availability: In Stock
• quantity: 4
• options: Ship-to-home
• started: August 18, 2025

general pistondon:

• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits
• condition: New

shipping pistondon:

• transit: 2-5 Days
• type: Fixed
• service: Standard
• cost: $0.00
• class: Standard

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