SPI 09-726-04A Piston Kit .040 73MM

( Brand: Spi ), ( Manufacturer Part Number: 09-726-04A ), ( Part Type: Piston ), ( Country Of Origin: Taiwan )

Review SPI .040 Over Bore Piston Kit Polaris 73mm fits RMK 500 1997–1999

Introducing the SPI 09-726-04A 040 Piston Kit, specifically designed for Polaris 500 RMK snowmobiles manufactured between the years 1997, 1998, and 1999. This piston kit is engineered to meet the unique demands of these snowmobiles, ensuring optimal performance and reliability.

The pistons in this kit are crafted from high-quality forged aluminum, a material renowned for its strength and durability. The piston crowns are designed with a 73mm bore size, ensuring a proper fit and precise engine operation. The pistons are further engineered with a dish shape that enhances power output and improves combustion efficiency.

The piston rings included in this kit are made from a nitrided steel alloy, a material that provides excellent wear resistance and reduces the risk of ring groove scuffing. The piston rings are also designed to provide a tight seal, reducing the potential for engine blowby and improving combustion efficiency.

Additionally, this piston kit includes new piston pin assemblies, which feature high-strength steel piston pins that are precision machined to ensure a perfect fit and optimal engine performance. The piston pin assemblies also include new piston pin bushings, which provide a smooth piston movement and reduce friction.

This piston kit is an excellent choice for Polaris 500 RMK snowmobile owners who want to maintain their snowmobiles in peak condition or for those who are looking to upgrade their engines for improved performance. By using high-quality materials and precise manufacturing processes, this piston kit delivers excellent durability, reliability, and power output.

In conclusion, the SPI 09-726-04A 040 Piston Kit is a must-have for Polaris 500 RMK snowmobile owners seeking to enhance their engine performance and reliability. This piston kit is carefully designed to meet the unique demands of these snowmobiles, ensuring a perfect fit and optimal engine operation. With its high-quality materials, precise manufacturing, and excellent durability, this piston kit is an excellent investment for any serious snowmobile enthusiast.

Pros and Cons of buying a SPI 09-726-04A 040 Piston Kit for Polaris 500 RMK (1997-1999, 73mm)

The SPI 09-726-04A 040 Piston Kit is designed for the Polaris 500 RMK snowmobiles manufactured between 1997 and 1999 with a 73mm bore. This kit includes new pistons, rings, and other related components aimed at improving engine performance and longevity.

1. Enhanced Engine Performance: The new pistons and rings can help improve combustion efficiency and overall engine performance.

2. Longevity: Replacing worn-out pistons and rings can help extend the life of the engine and prevent costly repairs down the line.

3. OEM Quality: SPI is a well-known aftermarket parts manufacturer, and their products are often considered to be of OEM quality.

4. Easy Installation: The kit includes all necessary components, making it a relatively straightforward upgrade for the average DIYer.

1. Cost: The SPI piston kit is not an inexpensive upgrade, which may deter some riders.

2. Potential for Engine Modifications: Installing high-performance pistons may require additional modifications to the engine or exhaust system to fully realize the potential gains.

3. Risk of Damage: As with any engine repair or upgrade, there is a risk of damaging components during the installation process.

4. Availability: Depending on your location, the SPI piston kit may not be readily available at local dealerships or retailers, requiring you to order online.

The decision to buy the SPI 09-726-04A 040 Piston Kit for your Polaris 500 RMK ultimately comes down to your personal priorities and budget. For those seeking improved performance and engine longevity, the benefits of this upgrade may outweigh the costs. However, for riders who are satisfied with their current engine performance or are on a tight budget, this may not be the best investment. Ultimately, careful consideration and research can help you make an informed decision.

If you decide to purchase the SPI 09-726-04A 040 Piston Kit, it is recommended that you follow the installation instructions carefully and take your time during the installation process to minimize the risk of damage. Additionally, consider any necessary modifications to the engine or exhaust system to fully realize the potential gains from this upgrade.

Details:

Manufactured by SPI. Made in Taiwan. 1999 RMK 500. Compatible with Polaris model's below: 1997 RMK 500.

All SPI pistons, rings, pins cir clips are manufactured to OEM specifications. Piston is for .040 over bore size 73.00mm. Includes piston, ring set, wrist pin cir clips as pictured. T-Molly series with Teflon-Molybdenum coating.

Piston weight is compatible with original piston. T-Molly series pistons reduce friction, resist seizure improve durability. 1998 RMK 500.

part #: 0972604a prices

• $74.95-$144.95

specifications enginesnowmobile:

• for models: Rmk, 500
• for makes: Polaris
• for years: 1997-1999
• brand: Spi
• mpn: 09-726-04a
• part type: Piston
• country of origin: Taiwan

payments enginesnowmobile:

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

general enginesnowmobile:

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

seller enginesnowmobile:

• city: Suamico, Wisconsin
• rating: 99.9%
• # reviews: 419497

offer enginesnowmobile:

• sold: 0
• quantity: 4
• started: June 8, 2026
• availability: In Stock
• options: Ship-to-home

shipping enginesnowmobile:

• service: Standard
• class: Standard
• transit: 3-7 Days
• cost: $0.00
• type: Fixed

returns enginesnowmobile:

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

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