PARTS UNLIMITED 4490-P264821-80 Piston Kit Big 440CC BORE-.020 2.687

( Manufacturer Part Number: 4490-P264821-80 ), ( Part Type: Piston )

Review PARTS UNLIMITED Piston Kit 440cc Big Inch Oversize To 2.687

Introducing the Unlimited 4490-P264821-80 piston kit, a high-performance upgrade for your 440cc engine. This big bore kit is designed for those seeking more power and torque from their engine.

This piston kit includes eight pistons, each with a bore size of 4.40 inches, which represents a significant increase from the standard size. The pistons are made of forged aluminum, ensuring superior strength and durability. The piston crowns are designed with a dish shape, which allows for a larger combustion chamber and increased compression ratio. This results in more efficient combustion and a noticeable increase in power output.

The pistons also feature a skirt design that is optimized for a snug fit in the cylinder bore. This ensures minimal clearance between the piston and the cylinder wall, reducing friction and improving engine efficiency. The piston pins are made of chrome molybdenum steel, providing excellent strength and durability.

Each piston comes with a matching piston ring set, which includes a compression ring, an oil control ring, and a top ring. These rings are made of high-quality, heat-treated steel and are designed to provide excellent sealing and longevity.

This piston kit is suitable for engines that have been bored out to accommodate the larger piston bore size. It is recommended for use with a compatible connecting rod and crankshaft. The kit also includes new wrist pins and pin bushings, ensuring a smooth and reliable engine operation.

In summary, the Unlimited 4490-P264821-80 piston kit is a high-performance upgrade for your 440cc engine. With its big bore design, forged aluminum pistons, and optimized skirt design, this kit provides increased power output, improved efficiency, and enhanced durability. It is a must-have for anyone looking to take their engine to the next level.

Unlimited 4490-P264821-80 Big Bore Piston Kit for 440cc Engine: Pros, Cons, and Recommendation

The Unlimited 4490-P264821-80 Big Bore Piston Kit is a popular upgrade for 440cc engines. In this analysis, we will explore the merits and demerits of purchasing this kit, followed by a conclusive recommendation.

1. Increased Power: The primary advantage of installing a big bore piston kit is the potential power gain. These pistons offer a larger displacement, which translates to more combustion, and ultimately, more power.

2. Improved Engine Performance: The kit can lead to enhanced engine performance, including improved throttle response and overall engine efficiency.

3. Durability: Big bore piston kits are often designed with stronger materials to withstand the increased power and stresses placed on the engine.

4. Customizability: This kit offers the flexibility to fine-tune the engine to specific performance requirements, such as increased horsepower or torque.

1. Cost: The Unlimited 4490-P264821-80 Big Bore Piston Kit can be relatively expensive compared to other engine upgrades or maintenance costs.

2. Complex Installation: Installing the piston kit can be a complex process, requiring specialized tools and technical expertise.

3. Potential Engine Damage: If not installed correctly, the piston kit could potentially cause engine damage, including piston ring damage or cracks in the engine block.

4. Fuel Consumption: A larger displacement engine will consume more fuel, leading to increased operating costs.

The Unlimited 4490-P264821-80 Big Bore Piston Kit offers significant power gains, improved engine performance, and increased durability. However, it comes with a higher cost, complex installation, potential engine damage, and increased fuel consumption. Ultimately, the decision to purchase this kit depends on your specific performance goals, budget, and technical expertise.

If you are seeking a substantial power increase for your 440cc engine and have the necessary budget, technical expertise, and resources for the complex installation, the Unlimited 4490-P264821-80 Big Bore Piston Kit is a worthwhile investment. However, if you're looking for a more cost-effective engine upgrade or are not confident in your installation abilities, it may be wise to consider alternative modifications.

Details:

This is helpful if you are buying multiple items. Parts without fitment are to be assumed universal and may require vehicle modification. I need to exchange an item. Oversize to 2.687in.

Parts Unlimited Piston Kit 440cc Big Bore-.020in.: Brand: Parts Unlimited, model Number: 4490-P264821-80. Compatibility: Years: Make: model: Application: Notes: 1985 - 1986 , 1986 w/ Reverse, 1986 Polaris's.

part #: 4490p26482180 prices

• $29.99-$46.59

specifications enginesnowmobile:

• mpn: 4490-p264821-80
• part type: Piston

seller enginesnowmobile:

• rating: 99.8%
• city: Sparks, NV
• # reviews: 74119

offer enginesnowmobile:

• availability: In Stock
• options: Ship-to-home
• quantity: 9
• started: January 4, 2026
• sold: 0

general enginesnowmobile:

• condition: New
• Snowmobile Parts > Engines Components > Snowmobile Engine Components

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• policy: Returns Accepted
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