1. Pistons, Rings & Piston Kits Products
  2. sku: 10638521745288713
  3. KB PERFORMANCE MN/N457

KB PERFORMANCE MN-N457 Cast Piston Set MN/N457 For

fits model: Flstc, Heritage, Softail. make: Harley, Davidson. year: 1988–1999.

N457 Kb Performance Mn/n457 Cast Piston Set For 1988-1999 Harley Davidson Flstc Heritage Softail Qq

( Brand: Kb Performance ), ( Manufacturer Part Number: MN/N457 ), ( Type: Cast Piston Sets ), ( Compatible Year: 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 ), ( Compatible Make: Harley Davidson ), ( Compatible Model: Flstc Heritage Softail Classic ), ( Bundle Description: 1 Pc Genuine Kb Cast Piston Sets ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review KB PERFORMANCE Mn/n457 Cast Piston Set For Harley Davidson fits HERITAGE SOFTAIL FLSTC 1988–1999

Introducing the KB Performance MN/N457 Cast Piston Set, an exceptional upgrade for your 1988-1999 Harley-Davidson FLSTC Heritage Softail motorcycle. This piston set, manufactured by KB Performance, is meticulously crafted to deliver superior performance, durability, and reliability to your engine.

Each piston in this set is made from high-quality forged aluminum alloy, ensuring strength and consistent size for precise engine operation. The piston tops are engineered with a dished design to optimize combustion efficiency, while the skirt areas are machined to exacting specifications for a perfect fit in your engine cylinder.

The KB Performance MN/N457 Cast Piston Set comes with matching piston rings, which are crucial for sealing the combustion chamber and maintaining compression. These rings are manufactured from heat-resistant, high-tensile materials to ensure a long-lasting seal and optimal engine performance.

Installing these pistons in your Harley-Davidson engine is a straightforward process, making this an accessible upgrade for both professional mechanics and dedicated enthusiasts. With the KB Performance MN/N457 Cast Piston Set, you can expect increased power output, improved engine response, and enhanced overall performance for your cherished Heritage Softail motorcycle.

In summary, the KB Performance MN/N457 Cast Piston Set is an excellent investment for any 1988-1999 Harley-Davidson FLSTC Heritage Softail owner looking to boost their engine's performance and reliability. With its high-quality materials, precise manufacturing, and straightforward installation process, this piston set is the ideal choice for those seeking to elevate their motorcycle's capabilities.

The KB Performance MN/N457 cast piston set is a popular upgrade for Harley-Davidson FLSTC Heritage Softail models produced between 1988 and 1999. This piston set is known for its improved performance and durability. In this analysis, we will discuss the pros and cons of purchasing this piston set for your Harley-Davidson.

Pros:

1. Increased Horsepower: The KB Performance piston set is designed to provide an increase in horsepower. This is due to the improved piston design, which allows for better combustion efficiency and increased power output.

2. Enhanced Durability: These pistons are made from a high-quality forged aluminum alloy, which makes them more durable than the OEM pistons. They are also designed to withstand higher temperatures and pressures, which is beneficial for high-performance riding.

3. Improved Compression: The piston set has a higher compression ratio than the stock pistons, which improves the engine's efficiency and power output.

4. Better Thermal Conductivity: The KB Performance pistons have improved thermal conductivity, which helps to dissipate heat more effectively. This is beneficial for prolonging the life of the engine and reducing the risk of engine damage.

5. Enhanced Appearance: The KB Performance pistons have a polished finish, which can add an aesthetic appeal to your engine.

Cons:

1. Higher Cost: The KB Performance piston set is more expensive than the stock pistons. This may be a deterrent for some riders who are on a budget.

2. Installation Complexity: Installing the KB Performance piston set requires some mechanical expertise. It may be necessary to remove the engine from the frame to install the new pistons, which can be a time-consuming and labor-intensive process.

3. Potential for Engine Damage: If not installed correctly, the new pistons can cause engine damage. It is essential to follow the installation instructions carefully and use the correct tools and techniques.

4. Potential for Engine Noise: The piston set may cause some additional engine noise due to the improved performance. This may not be a concern for all riders, but it is something to consider.

Conclusion:

The KB Performance MN/N457 cast piston set is an excellent upgrade for Harley-Davidson FLSTC Heritage Softail models produced between 1988 and 1999. It offers increased horsepower, enhanced durability, improved compression, better thermal conductivity, and an enhanced appearance. However, it also comes with a higher cost, installation complexity, potential for engine damage, and potential for additional engine noise. Ultimately, the decision to purchase this piston set depends on your budget, mechanical expertise, and riding preferences. If you are looking for improved performance and durability and are willing to invest the time and money, then the KB Performance piston set is an excellent choice. However, if you are on a budget or are not comfortable with the installation process, then it may be best to stick with the stock pistons.

Details:

Domed - Standard Bore 3.498in. Cast Piston Kit 80ci. KB Cast Piston Set for 1988 - 1999 Harley Davidson FLSTC Heritage Softail qq: Status: In Stock.

part #: mnn457 prices

  • $231.63-$300.79

specifications pistondon:

  • for models: Flstc, Heritage, Softail
  • for makes: Harley, Davidson
  • for years: 1988-1999
  • brand: Kb Performance
  • mpn: Mn/n457
  • type: Cast Piston Sets
  • compatible year: 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988
  • compatible make: Harley Davidson
  • compatible model: Flstc Heritage Softail Classic
  • bundle description: 1 Pc Genuine Kb Cast Piston Sets
  • core charge: Free No Core Charge
  • fitment type: Direct Replacement

shipping pistondon:

  • transit: 4-6 Days
  • class: Standard
  • type: Fixed
  • cost: $0.00
  • service: Standard

returns pistondon:

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

offer pistondon:

  • quantity: 1
  • options: Ship-to-home
  • availability: In Stock
  • sold: 0
  • started: February 15, 2026

seller pistondon:

  • # reviews: 17535
  • rating: 98.7%
  • city: Multiple warehouses

payments pistondon:

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general pistondon:

  • Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits
  • condition: New
for models: flstc, heritage, softail, for makes: harley, davidson, for years: 1988-1999, type: cast piston sets, compatible year: 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988, compatible make: harley davidson, compatible model: flstc heritage softail classic, bundle description: 1 pc genuine kb cast piston sets, core charge: free no core charge, fitment type: direct replacement,
category: motorcycle parts > motorcycle scooter parts accessories > engines engine parts > pistons, rings piston kits, sku: 10638521745288713,

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