MOOSE RACING 5YBLZ32A31 Piston Kit 78MM 13.51

( Brand: Moose Racing ), ( Manufacturer Part Number: 5YBLZ32A31 ), ( Type: Piston Kit ), ( California Prop 65 Warning: Warning, And Birth Defects Or Other Reproductive Harm. ), ( Item Weight: 0.9000 ), ( Package Quantity: Each )

Review MOOSE RACING 78mm Piston Kit 13.51 For Honda fits CRF250 STD 2002–2008

Introducing the Moose Racing 5YBLZ32A31 78mm Standard Piston Kit, specifically designed for Honda CRF250 models from 2002 to 2008. This high-performance piston kit is an excellent upgrade for riders seeking increased power and durability from their CRF250.

The Moose Racing 78mm piston kit includes a set of four high-quality pistons, each crafted from forged aluminum. This material ensures superior strength and rigidity, allowing the pistons to withstand the rigors of off-road racing and riding. The pistons feature a 78mm bore size, providing an increase in displacement, which translates to more power at the rear wheel.

Each piston is engineered with a flat top design, optimizing combustion efficiency and ensuring a consistent power delivery throughout the RPM range. The piston skirts are treated with a state-of-the-art coating, reducing friction and minimizing the risk of scuffing or scoring. This coating not only extends the piston's lifespan but also contributes to improved engine performance.

The Moose Racing 5YBLZ32A31 piston kit is designed to work seamlessly with the stock crankshaft and connecting rods. However, it is essential to use the appropriate Moose Racing rings to ensure proper ring gap and compression. This kit does not include rings, so be sure to order them separately to complete the installation.

The Moose Racing 5YBLZ32A31 78mm Standard Piston Kit is an excellent choice for riders looking to enhance their Honda CRF250's power output, durability, and overall performance. With its high-quality materials, precise engineering, and proven track record, this piston kit is an investment that will provide years of enjoyment and satisfaction on the trails.

Moose Racing 5YBLZ32A31 78mm Standard Piston Kit for Honda CRF250 (02-08): A Detailed Analysis

The Moose Racing 5YBLZ32A31 78mm Standard Piston Kit is a popular aftermarket upgrade for the Honda CRF250 (2002-2008) models. This piston kit aims to enhance performance, durability, and power. In this analysis, we will discuss the potential advantages and disadvantages of investing in this product.

1. Increased Power: The Moose Racing piston kit is designed to improve power output by increasing the piston size from the stock 67.5mm to a larger 78mm. This results in a more efficient combustion process, allowing for more power to be generated.

2. Enhanced Durability: The piston kit is made from high-quality materials, including forged aluminum pistons and steel wrist pins. These components are known for their strength and durability, making the kit suitable for high-performance riding and racing applications.

3. Improved Engine Response: The larger piston size allows for a more aggressive power delivery, resulting in a more responsive engine. This is particularly noticeable in the mid-range power band, making the bike more fun to ride.

4. Better Heat Management: The Moose Racing piston kit includes a high-performance piston ring set that helps to improve heat management within the engine. This is crucial for maintaining engine performance and longevity, especially during prolonged periods of high-speed riding.

1. Installation Complexity: Installing the Moose Racing piston kit requires a significant amount of expertise and experience. This is due to the precision involved in aligning the piston and cylinder, as well as the need for specialized tools.

2. Cost: Compared to the stock piston kit, the Moose Racing 5YBLZ32A31 78mm Standard Piston Kit is a more expensive upgrade. The cost difference may be a significant factor for budget-conscious riders.

3. Potential Powerband Shift: Installing the larger piston kit may cause a noticeable shift in the powerband. This could potentially require adjustments to the fuel mapping or ignition timing to ensure optimal engine performance.

The Moose Racing 5YBLZ32A31 78mm Standard Piston Kit offers several advantages, including increased power, enhanced durability, improved engine response, and better heat management. However, it also comes with some disadvantages, such as the complexity of installation and a higher cost compared to the stock piston kit.

If you are an experienced rider looking to extract maximum performance from your Honda CRF250 (02-08), the Moose Racing piston kit could be an excellent investment. However, if you are a beginner or budget-conscious rider, the added complexity and cost may outweigh the benefits.

If you are considering the Moose Racing 5YBLZ32A31 78mm Standard Piston Kit for your Honda CRF250 (02-08), ensure that you have the required expertise, tools, and budget to complete the installation process. Consult with a professional mechanic or a trusted aftermarket parts supplier to discuss the potential benefits and drawbacks of the upgrade, and determine if it is the right choice for your riding style and needs.

Details:

Pro Race Piston increases the durability by reducing stresses in pin bore area. Moose is a proud supporter of their racers and riders at every level, which why 78mm STD Piston Kit 13.51 was designed manufactured to be used on the trails track. Moose Racing is the place to go for anything ATV or UTV related. Made in the USA.

Each Moose Racing piston kit includes a high performance piston, wrist pin, rings, cir clips and top end gasket. Full radius dome designs maximize quench while eliminating hot spots that promote detonation. Moose Racing pistons feature X-style forgings and fully boxed-style race pistons for ultimate strength, minimizing friction, durability, power, weight reduction. Be sure to use race fuel with some applications.

Any fitment provided is for US Spec model's. Use our shipping packaging to ship back the item, DO NOT tape label directly original manufacturers box. Internal bracing maximizes durability while decreasing friction in the pin assembly.

Compatible Make. Race piston kit includes a DLC pin; this technology has been proven and used because of its high resistance to abrasive wear, which extends the service life reliability under extreme conditions. 2002 Honda CRF250. Pro Race Piston allows the pin to flex while removing stress from area.

Item must be in original undamaged unopened packaging. 2003 Honda CRF250. Fully-boxed race pistons forgings come standard with skirt coating which reduces friction, in turn heat these are called out the application chart. 2004 Honda CRF250.

OEM Replacement Numbers.

part #: 5yblz32a31 price

• $326.95

specifications pistondon:

• for models: Crf250, Std
• for makes: Honda
• for years: 2002-2008
• brand: Moose Racing
• mpn: 5yblz32a31
• type: Piston Kit
• california prop 65 warning: Warning, And Birth Defects Or Other Reproductive Harm.
• item weight: 0.9000
• package quantity: Each

shipping pistondon:

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

returns pistondon:

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

offer pistondon:

• availability: In Stock
• quantity: 4
• options: Ship-to-home
• sold: 0
• started: November 3, 2025

general pistondon:

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

payments pistondon:

• wallet: Paypal
• other
• credit card: Diners-club

seller pistondon:

• city: Parkersburg, West Virginia
• rating: 99.1%
• # reviews: 23702

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