SPI 120798 Top Overbore End Kit Fan Cooled Crank Seals .10

( Brand: Spi ), ( Manufacturer Part Number: 120798 ), ( Part Type: Fan Seal Crank )

Review SPI .10 Overbore Bore Top End Kit Polaris Fan Cooled Crank Seals fits 550 1999–2021

The SPI 120798 10 Overbore Top End Kit is an essential upgrade for Polaris 550 fan-cooled models produced between 1999 and 2021. This top end kit includes all necessary components needed to renovate and enhance the performance of your engine.

The kit is engineered specifically for the Polaris 550, ensuring a perfect fit and reliable function. It includes ten overbore piston rings to increase compression and power output. The high-quality piston rings are made to minimize friction, extend engine life, and ensure optimal cylinder seal.

Moreover, the SPI Overbore Top End Kit also includes a set of skirted pistons. Skirted pistons minimize piston slap, a common issue in high-performance engines, which can lead to premature wear and decreased power. These skirts also increase the seal contact, enabling excellent ring-to-cylinder sealing and ensuring optimal engine performance.

Another critical component in this kit is the new, high-performance cylinder head gasket. This gasket provides an improved seal between the cylinder head and engine block, reducing the risk of leaks and ensuring that all combustion gases are efficiently channeled out of the engine.

The overbore top end kit also includes new crank seals. These seals ensure that the engine oil remains contained within the crankshaft, preventing oil leaks and prolonging the longevity of your Polaris 550 engine.

In summary, the SPI 120798 10 Overbore Top End Kit is an excellent investment for Polaris 550 fan-cooled models. This comprehensive kit enhances performance, improves sealing, and extends engine life, making it an invaluable addition for those seeking to get the most out of their off-road vehicle.

Pros and Cons of Buying a SPI 120798 10 Overbore Top End Kit for Polaris 550 (Fan Cooled, 1999-2021, Crank Seals)

The SPI 120798 10 Overbore Top End Kit for Polaris 550 (fan cooled, 1999-2021, crank seals) is an aftermarket performance upgrade for your Polaris ATV or UTV engine. This kit includes items such as pistons, rings, gaskets, cylinder sleeves, crank seals, and other necessary hardware. Here are some potential advantages and disadvantages of purchasing this top end kit.

1. Increased Horsepower: The overbore design of this top end kit allows for increased bore size, leading to increased engine displacement and potential horsepower gains. This can result in enhanced acceleration and overall performance.

2. Durability: The use of top-tier materials in the construction of the pistons, rings, and cylinder sleeves can provide improved durability, allowing for extended time between engine rebuilds.

3. Improved Compatibility: This top end kit is designed specifically for fan-cooled Polaris 550 models from 1999 to 2021, ensuring a precise fit and compatibility.

4. Reduced Maintenance: By addressing issues such as worn pistons, rings, and seals, this kit can help reduce the need for frequent engine maintenance, saving you time and money in the long run.

1. Cost: The SPI 120798 10 Overbore Top End Kit can be a significant investment for some ATV or UTV owners. Ensuring the benefit of the increased horsepower and durability justify the expense is essential.

2. Installation Complexity: Installing the overbore top end kit can be a time-consuming and technically challenging task, as it involves disassembling the engine, replacing various components, and then reassembling it. This may require professional assistance or a high degree of mechanical skill.

3. Potential Powerband Shift: Installing an overbore top end kit can result in a noticeable shift in the ATV or UTV's powerband. While this can be desirable for some applications, it may not be preferred for others. Be sure to consider the implications before making the investment.

In summary, the SPI 120798 10 Overbore Top End Kit for Polaris 550 (fan cooled, 1999-2021, crank seals) can provide increased horsepower, durability, and compatibility for fan-cooled Polaris 550 owners. However, it comes with a significant investment associated with the purchase price and installation complexities. carefully weigh the pros and cons before deciding if this performance upgrade is right for you.

Only consider purchasing this top end kit if you are confident in your ability to install it or have the means to hire a professional to do so. This kit can be a valuable investment for those seeking increased power and durability from their Polaris 550. However, it may not be suitable for those who are looking for a low-cost upgrade or do not have the time or resources for a complex installation.

Details:

Top end gasket kit contains all gaskets pictured to rebuild top oil seals not included. Piston weight compatible with original piston. Includes 2 pistons, ring sets, wrist pins, cir clips, top bearings and end gasket kit. 1999 Super Sport 550 Trail RMK 2000 Sport Touring 2001 ES 2002 Classic 2003 X 2004 Pro 2005 Deluxe 2006 2007 LX 2008 2009 IQ Shift 2010 2011 LXT 136 2012 2013 2014 Indy 144 Adventure Voyager 2015 155 Voyageur 2016 Sidetrack 2017 2018 2019 EVO 2020 121 2021 SPI.

T-Molly series pistons reduce friction, resist seizure improve durability. T-Molly series with Teflon-Molybdenum coating. SPI .10 Overbore Bore Top End Kit, Complete Gasket Kit And Two Piston Kits Manufactured to OEM spec by. Made in Taiwan.

Pistons are for .10 over bore 73.25mm. All pistons, rings, pins and cir clips are manufactured to OEM specifications.

specifications enginesnowmobile:

• for models: 550
• for makes: Polaris
• for years: 1999-2021
• brand: Spi
• mpn: 120798
• part type: Fan Seal Crank

offer enginesnowmobile:

• quantity: 4
• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: January 21, 2025

returns enginesnowmobile:

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

general enginesnowmobile:

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

seller enginesnowmobile:

• city: Homer, New York
• # reviews: 24812
• rating: 99.4%

payments enginesnowmobile:

• other
• credit card: Visa
• wallet: Paypal

shipping enginesnowmobile:

• service: FedEx Ground or FedEx Home Delivery
• transit: 2-6 Days
• carrier: FedEx
• type: Calculated
• class: Standard
• cost: $0.00

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