1. Pistons, Rings & Piston Kits Products
  2. sku: 9735513061473633
  3. KB PERFORMANCE MN/C4J1

KB PERFORMANCE MN-C4J1 Cast Piston Set Engine Vd MN/C4J1 For

fits model: Flstf, Fat, Boy. make: Harley, Davidson. year: 1990–1999.

C4j1 Kb Performance Mn/c4j1 Cast Piston Set For 1990-1999 Harley Davidson Flstf Fat Boy - Engine Vd

( Brand: Kb Performance ), ( Manufacturer Part Number: MN/C4J1 ), ( Type: Cast Piston Sets ), ( Compatible Year: 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 ), ( Compatible Make: Harley Davidson ), ( Compatible Model: Flstf Fat Boy ), ( Bundle Description: 1 Pc Genuine Kb Cast Piston Sets ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review KB PERFORMANCE Mn/c4j1 Cast Piston Set For Harley Davidson Engine Vd fits FAT BOY FLSTF 1990–1999

Introducing the KB Performance MN/C4J1 Cast Piston Set, an excellent upgrade for the Harley-Davidson FLSTF Fat Boy engine model produced between 1990 and 1999. This piston set is specifically designed to deliver superior performance and longevity, making it an ideal choice for riders seeking to enhance their motorcycle experience.

Each piston in this set is meticulously crafted using high-quality, forged aluminum alloy. The material's lightweight nature reduces rotating mass, allowing for increased engine response and improved power delivery. The pistons' crown shape and design provide optimal combustion efficiency, ensuring maximum power output from your Fat Boy engine.

Additionally, these pistons feature a state-of-the-art, skirt coating that minimizes friction and wear. This coating not only contributes to smoother engine operation but also significantly extends the pistons' lifespan, allowing you to enjoy the benefits of this upgrade for years to come.

The KB Performance MN/C4J1 Cast Piston Set is engineered to be a direct replacement for the OEM pistons in your Harley-Davidson FLSTF Fat Boy engine. The pistons are designed with the correct pin bore size, ring groove dimensions, and other critical specifications to ensure a perfect fit and easy installation.

In conclusion, the KB Performance MN/C4J1 Cast Piston Set is an exceptional upgrade for your 1990-1999 Harley-Davidson FLSTF Fat Boy engine. With its high-quality materials, advanced design, and commitment to improved performance and durability, this piston set is a must-have for any serious motorcycle enthusiast. Upgrade your engine today and experience the difference that KB Performance's piston set can make.

Buying a KB Performance MN/C4J1 cast piston set for a 1990-1999 Harley-Davidson FLSTF Fat Boy engine can be a consideration for those looking to improve their motorcycle's performance. Here are some pros and cons to help make an informed decision.

Pros:

1. Enhanced Performance: The KB Performance pistons are designed to provide better compression ratio, leading to increased power and torque.

2. Durability: Cast pistons are known for their superior strength and durability compared to forged pistons, making them a suitable choice for high-performance applications.

3. Improved Engine Response: The enhanced compression ratio can lead to improved engine response and throttle sensitivity.

4. Customizable: KB Performance offers various piston sizes to cater to different riding styles and power goals, allowing riders to tailor their engine to their specific needs.

Cons:

1. Cost: KB Performance pistons are generally more expensive than OEM pistons or aftermarket forged pistons, which may be a deterrent for some riders.

2. Installation Complexity: Installing performance pistons in a motorcycle engine requires skilled labor and specialized tools, adding to the overall cost and time investment.

3. Potential Power Increase: It is important to note that the new pistons may lead to an increase in power output, which may require additional modifications or upgrades to the motorcycle to handle the increased power safely and effectively.

Conclusion:

The KB Performance MN/C4J1 cast piston set for a 1990-1999 Harley-Davidson FLSTF Fat Boy engine offers several advantages, such as improved performance, durability, and customizability. However, it comes with a higher cost, installation complexity, and potential power increase that need to be considered. Ultimately, the decision to purchase these pistons depends on individual priorities, budget, and riding goals.

Recommendation:

If you are looking to significantly improve the performance of your Harley-Davidson Fat Boy engine and are willing to invest in the associated costs and complexities, the KB Performance MN/C4J1 cast piston set could be a worthwhile investment. However, if you are on a tight budget or prefer a more straightforward upgrade, you may want to consider other options, such as aftermarket exhaust systems or air filters, to enhance your motorcycle's performance.

Details:

Cast Piston Kit 80ci. Flat Top - .020in. KB Cast Piston Set for 1990 - 1999 Harley Davidson FLSTF Fat Boy - Engine vd: Status: In Stock. Oversize to 3.518in.

part #: mnc4j1 price

  • $341.18

specifications pistondon:

  • for models: Flstf, Fat, Boy
  • for makes: Harley, Davidson
  • for years: 1990-1999
  • brand: Kb Performance
  • mpn: Mn/c4j1
  • type: Cast Piston Sets
  • compatible year: 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990
  • compatible make: Harley Davidson
  • compatible model: Flstf Fat Boy
  • bundle description: 1 Pc Genuine Kb Cast Piston Sets
  • core charge: Free No Core Charge
  • fitment type: Direct Replacement

shipping pistondon:

  • type: Fixed
  • service: Standard
  • class: Standard
  • cost: $0.00
  • transit: 3-6 Days

returns pistondon:

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

offer pistondon:

  • started: January 4, 2026
  • sold: 0
  • options: Ship-to-home
  • availability: In Stock
  • quantity: 1

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seller pistondon:

  • # reviews: 15612
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general pistondon:

  • condition: New
  • Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits
for models: flstf, fat, boy, for makes: harley, davidson, for years: 1990-1999, type: cast piston sets, compatible year: 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990, compatible make: harley davidson, compatible model: flstf fat boy, 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: 9735513061473633,

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  • Offer #1: $341.18 price + $0.00 shipping estimate = $341.18* total. Cast Piston Kit (80ci., Flat Top) - .020in.FREE SHIPPING

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