1. Pistons, Rings & Piston Kits Products
  2. sku: 11154187327989713
  3. KB PERFORMANCE MN/X7AC

KB PERFORMANCE MN-X7AC Cast Piston Set Fxstc MN/X7AC For

fits model: Softail. make: Harley, Davidson. year: 1986–1999.

X7ac Kb Performance Mn/x7ac Cast Piston Set For 1986-1999 Harley Davidson Fxstc Softail Custom - Yy

( Brand: Kb Performance ), ( Manufacturer Part Number: MN/X7AC ), ( Type: Cast Piston Sets ), ( Compatible Year: 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 ), ( Compatible Make: Harley Davidson ), ( Compatible Model: Fxstc Softail Custom ), ( Bundle Description: 1 Pc Genuine Kb Cast Piston Sets ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review KB PERFORMANCE Mn/x7ac Cast Piston Set For Harley Davidson Fxstc Custom fits SOFTAIL 1986–1999

Introducing the KB Performance MN/X7AC Cast Piston Set, an exceptional upgrade for your 1986-1999 Harley-Davidson FXSTC Softail motorcycle. This piston set is meticulously engineered to deliver superior performance and reliability, enhancing the overall riding experience.

The MN/X7AC pistons are crafted from high-strength, forged aluminum alloy. This material offers excellent heat dissipation properties, ensuring consistent engine temperatures and reducing the risk of thermal stress. The piston tops are CNC machined to ensure a perfect fit and finish, while the piston skirts are designed with a state-of-the-art honing process to guarantee a seamless engagement with the cylinder walls.

These pistons feature a compression height that is optimized for modern fuel types and high-performance ignition systems. The result is increased power output and torque, delivering a more responsive and exhilarating ride.

The KB Performance MN/X7AC Cast Piston Set also includes new rings, including a compression ring, oil control ring, and two piston rings. These rings are precision-manufactured from high-quality materials, ensuring a perfect seal and reducing the risk of oil consumption and engine wear.

The piston set is also designed to work seamlessly with your Harley-Davidson's existing connecting rods and crankshaft. With no need for costly and time-consuming engine rebuilds, this upgrade is an affordable and effective way to boost the performance of your Softail.

Installation is straightforward and can be completed in a typical home garage setup. The piston set comes with detailed installation instructions, ensuring a hassle-free experience. With the KB Performance MN/X7AC Cast Piston Set, you can confidently expect improved performance, reliability, and longevity for your Harley-Davidson FXSTC Softail.

Pros and Cons of Buying KB Performance MN/X7AC Cast Piston Set for 1986-1999 Harley-Davidson FXSTC Softail

The KB Performance MN/X7AC cast piston set is an aftermarket piston option for Harley-Davidson FXSTC Softail motorcycles manufactured between 1986 and 1999. These pistons are known for their high-performance capabilities, but as with any aftermarket part, they come with their advantages and disadvantages. In this analysis, we will discuss the key pros and cons, ending with a conclusion and recommendation.

Pros:

1. Enhanced Performance: The primary reason for choosing the KB Performance MN/X7AC pistons is their performance enhancement. They offer increased horsepower and torque, allowing your motorcycle to perform better and respond more aggressively.

2. Durability: Cast pistons are renowned for their durability. They are less prone to cracking and warping compared to their forged counterparts, making them an excellent choice for high-performance applications.

3. Cost-Effective: Although the upfront cost may be higher than stock pistons, the longevity and performance benefits make them a cost-effective choice in the long run.

4. Customization: The KB Performance MN/X7AC pistons offer the opportunity for customization. You can choose different dome shapes, skirt coatings, and ring packages to suit your specific riding style and engine configuration.

Cons:

1. Installation Complexity: Installing aftermarket pistons is not a simple task. It requires expertise, specialized tools, and a significant amount of time. You may also need to perform additional modifications to ensure proper fitment and functionality.

2. Compatibility: Ensure that the KB Performance MN/X7AC pistons are compatible with your specific engine configuration, including the crankshaft, connecting rods, and cylinder heads. Incorrect fitment can lead to engine damage and poor performance.

3. Expense: While the performance and durability benefits may make these pistons cost-effective in the long run, the upfront cost is higher than stock pistons. Additionally, there may be additional expenses for installation, modifications, and other related components.

4. Warranty: Aftermarket parts like the KB Performance MN/X7AC pistons may not come with the same level of warranty coverage as stock parts. Be sure to check with the manufacturer for any available warranties and understand their terms.

Conclusion:

The KB Performance MN/X7AC cast piston set for 1986-1999 Harley-Davidson FXSTC Softails offers significant performance benefits, enhanced durability, and the opportunity for customization. However, they also come with increased installation complexity, potential compatibility issues, and a higher upfront cost. Ultimately, the decision to purchase these pistons depends on your riding style, budget, and technical expertise. If you are comfortable with the installation process and are looking for increased performance and durability, the KB Performance MN/X7AC pistons may be an excellent choice for your Harley-Davidson Softail.

Recommendation:

If you decide to purchase the KB Performance MN/X7AC cast piston set, make sure to work with a reputable dealer or installer with experience in Harley-Davidson engines. Proper installation and configuration are crucial for achieving optimal performance and avoiding potential engine damage. Additionally, consider the additional costs for installation, modifications, and any necessary warranty coverage when factoring the overall expense.

Details:

KB Cast Piston Set for 1986 - 1999 Harley Davidson FXSTC Softail Custom - yy: Status: In Stock. Flat Top - .030in. Cast Piston Kit 80ci. Oversize to 3.528in.

part #: mnx7ac price

  • $231.63

specifications pistondon:

  • for models: Softail
  • for makes: Harley, Davidson
  • for years: 1986-1999
  • brand: Kb Performance
  • mpn: Mn/x7ac
  • type: Cast Piston Sets
  • compatible year: 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987
  • compatible make: Harley Davidson
  • compatible model: Fxstc Softail Custom
  • bundle description: 1 Pc Genuine Kb Cast Piston Sets
  • core charge: Free No Core Charge
  • fitment type: Direct Replacement

payments pistondon:

  • other
  • wallet: Google-pay
  • credit card: Discover

general pistondon:

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

offer pistondon:

  • quantity: 1
  • availability: In Stock
  • started: March 12, 2026
  • options: Ship-to-home
  • sold: 0

seller pistondon:

  • city: Multiple warehouses
  • rating: 98.8%
  • # reviews: 18698

returns pistondon:

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

shipping pistondon:

  • service: Standard
  • class: Standard
  • cost: $0.00
  • transit: 2-6 Days
  • type: Fixed
for models: softail, for makes: harley, davidson, for years: 1986-1999, type: cast piston sets, compatible year: 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987, compatible make: harley davidson, compatible model: fxstc softail custom, 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: 11154187327989713,

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1 offer $231.63 USD
  • Offer #1: $231.63 price + $0.00 shipping estimate = $231.63* total. Cast Piston Kit (80ci., Flat Top) - .030in.FREE SHIPPING

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