NAMURA ATTO-PO391523-16 Utv Topend Rebuild Kit 88.39MM

( Brand: Namura ), ( Manufacturer Part Number: ATTO-PO391523-16 )

Review NAMURA Polaris Utv Topend Rebuild Kit 88.39mm fits RANGER 400 4X4 2010–2014

Introducing the Namura Atto-PO391523-16 Top End Rebuild Kit, specifically designed for the Polaris Ranger 400 4x4 UTV model from 2010 to 2014. This top-of-the-line rebuild kit includes everything needed to breathe new life into the engine, ensuring optimal performance and reliability.

The heart of this kit is a set of high-performance, precision-machined cylinder liners, which are designed to provide superior wear resistance and reduce friction. These liners are crafted using advanced materials and manufacturing techniques to ensure a perfect fit and excellent sealing properties.

The Namura Atto-PO391523-16 Top End Rebuild Kit also includes a complete set of forged pistons, which are engineered to deliver superior strength and durability. The pistons are designed with optimized piston crown shape, ring grooves, and pin bosses to provide improved combustion efficiency and longer engine life.

Moreover, the kit comes with a set of high-quality rings, which include compression rings, oil control rings, and skirt rings. These rings are made from advanced materials that provide improved sealing and reduced wear, leading to improved engine performance and longer engine life.

Additionally, the Namura Atto-PO391523-16 Top End Rebuild Kit includes a set of high-performance cylinder heads, which are designed to provide improved airflow and better cooling. These cylinder heads are engineered with optimized port design, larger valves, and improved valve guides to provide improved power and torque.

The kit also includes a set of high-performance camshafts, which are designed to provide improved valve lift and better timing. These camshafts are engineered with optimized cam profile, duration, and lift to provide improved engine performance and better fuel efficiency.

Furthermore, the Namura Atto-PO391523-16 Top End Rebuild Kit includes a set of high-performance valves, which are designed to provide improved airflow and better sealing. These valves are engineered with optimized valve seat design, material, and size to provide improved engine performance and longer engine life.

Lastly, the kit includes a set of high-quality gaskets and seals, which ensure a perfect seal between engine components and provide improved engine compression and performance.

In summary, the Namura Atto-PO391523-16 Top End Rebuild Kit is a comprehensive solution for rebuilding the engine of your Polaris Ranger 400 4x4 UTV from 2010 to 2014. With its high-performance components, advanced materials, and precise manufacturing, this kit ensures improved engine performance, reliability, and longevity. Whether you're looking to restore your UTV to its original glory or take it to the next level, the Namura Atto-PO391523-16 Top End Rebuild Kit is the perfect choice.

Top End Rebuild Kit for Polaris Ranger 400 4x4 UTV (Namura Atto-Po391523-16): A Comprehensive Analysis

The Namura Atto-Po391523-16 top end rebuild kit is designed for Polaris Ranger 400 4x4 UTVs from the 2010 to 2014 model years. This kit includes all the necessary components for rebuilding the engine's upper part. In this analysis, we will discuss the pros and cons of purchasing this top end rebuild kit and conclude with a recommendation based on the findings.

1. Comprehensive Kit: The Namura Atto-Po391523-16 top end rebuild kit includes all the essential components required for a top end engine rebuild, such as pistons, rings, cylinder liners, and gaskets. This makes it a convenient and cost-effective solution for those looking to rebuild their Polaris Ranger 400 engine.

2. High-Quality Materials: Namura is a well-known and reputable manufacturer that provides high-quality aftermarket parts. The components in this rebuild kit are designed to meet or exceed OEM specifications, ensuring a reliable and durable engine rebuild.

3. Improved Engine Performance: A top end engine rebuild can help improve the overall performance of the Polaris Ranger 400 UTV. New pistons, rings, and cylinder liners can lead to better fuel efficiency, increased power, and smoother operation.

4. Cost-Effective: Rebuilding the engine instead of buying a new one can save a significant amount of money, especially for older models where replacement engines may be difficult to find or expensive.

1. Time-Consuming: Engine rebuilds can be a complex and time-consuming process, requiring a good deal of mechanical knowledge and experience. The process may also involve additional expenses for tools and shop space.

2. Risk of Damaging Other Engine Components: During the rebuild process, there is a risk of damaging other engine components if not handled carefully. For instance, accidentally dropping a piston ring into the crankcase can result in costly repairs.

3. Potential for OEM Part Compatibility Issues: While Namura is a reputable manufacturer, there is still a possibility of compatibility issues with OEM parts. It is essential to ensure that all the components in the rebuild kit are compatible with the specific Polaris Ranger 400 model and year.

The Namura Atto-Po391523-16 top end rebuild kit for the Polaris Ranger 400 4x4 UTV offers several advantages, including high-quality materials, improved engine performance, and cost-effectiveness. However, it also comes with some disadvantages, such as the time-consuming nature of the engine rebuild process and the potential for damaging other components.

Based on the analysis, if you have the mechanical skills, experience, and resources to perform an engine rebuild, the Namura Atto-Po391523-16 top end rebuild kit can be an excellent investment for your Polaris Ranger 400 UTV. It provides an opportunity to save money while ensuring a reliable and durable engine. However, if you lack the expertise or resources, it may be wiser to consider having a professional mechanic handle the rebuild or purchasing a new engine instead.

If you have the necessary skills, experience, and resources to perform an engine rebuild and are confident in your ability to handle the process, the Namura Atto-Po391523-16 top end rebuild kit for the Polaris Ranger 400 4x4 UTV is a cost-effective and reliable solution for revitalizing your engine. However, if you are unsure about your abilities or resources, it is recommended to consult a professional mechanic or consider purchasing a new engine. Ultimately, the decision depends on your mechanical expertise, budget, and personal preferences.

part # attopo39152316 price

• $127.45

specifications atvsienna:

• for models: 400, 4x4, Ranger
• for makes: Polaris
• for years: 2010-2014
• brand: Namura
• manufacturer part number: ATTO-PO391523-16

seller atvsienna:

• # reviews: 64603
• rating: 99.5%

payments atvsienna:

• other
• credit card: Discover
• wallet: Apple-pay

offer atvsienna:

• quantity: 9
• availability: In Stock
• options: Ship-to-home
• sold: 0
• started: August 9, 2025

shipping atvsienna:

• class: Standard
• service: Standard
• transit: 4-7 Days
• cost: $0.00
• type: Fixed

general atvsienna:

• ATV, Side-by-Side UTV Parts Accessories > Engines Engine Parts > Other Engine Parts
• condition: New

returns atvsienna:

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

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